Intelligent laser interlock system

Information

  • Patent Grant
  • 9281653
  • Patent Number
    9,281,653
  • Date Filed
    Thursday, July 19, 2012
    12 years ago
  • Date Issued
    Tuesday, March 8, 2016
    8 years ago
Abstract
Systems and methods are disclosed for shutting down a laser system in an intelligent and flexible manner. An intelligent laser interlock system includes both hardwired components, and intelligent components configured to execute computing instructions. The hardwired components and the intelligent components are configured to shutdown the laser system to one or more alternative shutdown states in response to one or more interlock signals.
Description
BACKGROUND

1. Field of the Invention


The present invention relates in general to the fields of laser light amplification and software control systems.


2. Related Art


Laser interlock systems are configured to ensure a laser system operator's safety and/or to protect one or more laser system components from damage. Laser interlock systems typically include electro-mechanical systems configured to shutdown a laser system when some operational limit has been exceeded. For example, mechanical laser interlock systems may include mechanical relays connected to simple hardwired logic circuits. The mechanical relays are configured to close a shutter or cut power to one or more laser system components within the laser system, thereby shutting down the laser system. For example, a laser interlock system may be configured to activate a mechanical relay configured to disable laser light generation when a system cover is opened.


The simple approach of prior laser interlock systems causes a total shutdown of the laser system. While ensuring safety, the total shutdown has a number of drawbacks. For example, the laser system may need to be warmed up and calibrated again after a total shutdown before the laser system is again operational. There is, therefore, a need for improvements in laser interlock systems.


SUMMARY

The present invention comprises, in various embodiments, systems and methods for shutting down a laser system in an intelligent and flexible manner. An intelligent laser interlock system includes a first module comprising hardwired components, and a second module comprising intelligent components configured to execute computing instructions. The hardwired components and the intelligent components are configured to shutdown the laser system to one or more alternative shutdown states in response to one or more interlock signals. These alternative shutdown states include intermediate shutdown states in which parts but not all of the laser system are shutdown.


Various embodiments of the invention include a system comprising an oscillator configured to generate a laser light pulse, an amplifier configured to receive the laser light pulse from the oscillator and amplify the laser light pulse, and a control system comprising an input configured to receive an interlock signal, an integrated circuit configured to select a shutdown state from a plurality of alternative shutdown states based on the interlock signal, and an output configured to place the system in the selected shutdown state.


Various embodiments of the invention include a system comprising a light source configured to generate a laser light pulse, and a control system comprising a hardwired interlock module configured to shutdown a first part of the light source, and an intelligent interlock module configured to shutdown a second part of the light source by executing computing instructions.


Various embodiments of the invention include a method comprising receiving an interlock signal, shutting down a laser system to a first shutdown state responsive to the interlock signal, the first shutdown state being an intermediate shutdown state, analyzing the interlock signal, and shutting down the laser system to a second shutdown state based on the analysis of the interlock signal.





BRIEF DESCRIPTION OF THE DRAWINGS


FIG. 1 illustrates a laser system, according to various embodiments of the invention;



FIG. 2 is a block diagram that illustrates an intelligent laser interlock system, according to various embodiments of the invention;



FIG. 3 illustrates methods of using the intelligent laser interlock system illustrated in FIG. 2, according to various embodiments of the invention; and



FIG. 4 illustrates methods of shutting down the laser system of FIG. 1, according to various embodiments of the invention.





DETAILED DESCRIPTION

In some embodiments of the present invention, an intelligent laser interlock system is configured to shutdown a laser system to one or more alternative shutdown states in an intelligent manner. The laser system typically includes multiple components, such as an optical oscillator configured to generate a laser light pulse and an optical amplifier configured to amplify the laser light pulse. The alternative shutdown states may include one or more partial shutdown states in which some but not all of the multiple laser system components are shutdown. For example, in some embodiments, one of the one or more intermediate (e.g., partial) shutdown states includes shutting down an optical amplifier but not shutting down an optical oscillator. In some embodiments, establishing a shutdown state includes shutting down one or more components external to the laser system.


In some embodiments, the intelligent laser interlock system is configured to be programmed by an end user or a developer to specify one or more system shutdown processes. The developer can be a vendor, a reseller, an original equipment manufacturer, a systems integrator, an engineer, or an entity that provides the intelligent laser interlock system to the end user. The one or more system shutdown processes include a shutdown sequence specifying an order in which laser system components are to be shutdown and including a shutdown timing specifying a time at which each of the one or more laser system components are to be shutdown in relation to one another. Each of the one or more system shutdown processes is configured to place the laser system into one of the plurality of shutdown states.


In various embodiments, the intelligent laser interlock system is configured to shut down the one or more laser system components in a shutdown sequence starting with one or more downstream components and ending with one or more upstream components. Upstream and downstream are defined with respect to the direction of propagation of the laser beam. For example, those laser system components that are configured to initially generate a laser light pulse are considered to be upstream relative to those components that amplify the generated laser light pulse.


The intelligent laser interlock system includes a hardwired interlock module whose functionality is determined by hardwired electrical connections and optionally simple logic gates. Functionality of the hardwired components is typically fixed and not configurable without rewiring or physically changing circuits. The hardwired interlock module is configured to respond to one or more hardwired interlock triggers by activating relays, shutters, and/or the like. For example, a hardwired interlock trigger may be activated by opening of a system cover. The hardwired interlock module may respond to this hardwired interlock trigger by closing a shutter such that a user is not exposed to laser light.


The intelligent laser interlock system further includes an intelligent interlock module whose functionality is determined by computing instructions. The intelligent interlock module is typically configured to respond to one or more intelligent interlock triggers by executing these computing instructions. The computing instructions may be configured to sequentially shut down components of the laser system in a prescribed order, to shut down the laser system to an intermediate shutdown state responsive to an analysis of the intelligent interlock trigger, to enable and disable various control signals, to operate relays, to operate shutters, and/or the like.


In some embodiments, the intelligent interlock module is configured to be programmed in order to customize a system shutdown process. For example, a user may program the system shutdown process via an external computer system, a software program, or a laser system control panel. Alternatively, a vendor may program the system shutdown process via an external computer system, an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA), a microprocessor, software, or firmware. The computing instructions that the intelligent interlock module is configured to execute may be embodied in firmware, hardware, or software stored on a computer readable medium. The intelligent interlock module may comprise a microprocessor, an integrated circuit, a Field Programmable Gate Array, a programmable logic device, or the like. The intelligent interlock module may also be configured to connect to an external computer system.


An intelligent interlock trigger may be configured to be activated if the temperature of an optical amplifier exceeds a predetermined threshold. In response to this intelligent interlock trigger, the intelligent interlock module may cause a partial shutdown of the optical amplifier module such that the optical amplifier module can cool. This partial shutdown of the optical amplifier may not require shutdown of other system components of the laser system. The intelligent interlock module enables minor anomalous situations requiring a partial shutdown to be efficiently handled while maintaining an operational readiness state in the rest of the laser system.



FIG. 1 illustrates various embodiments of a laser system generally designated 100 and configured to generate a laser beam output 102 using an amplifier 104 and an oscillator 106 under the control of a control system 108. This control includes causing the oscillator 106 and amplifier 104 to generate the laser beam output according to a user's needs as well as managing the intelligent interlock system. The control system 108, the oscillator 106, and the amplifier 104 are typically each electrically connected to one another and are optionally included within a single enclosure. For example, there are electrical connections between oscillator 106 and amplifier 104 that are not shown in FIG. 1.


The control system 108 comprises a plurality of components including control logic 112, optional user inputs 110, an optional external control interface 132, an optional display 116, and optional storage 114. In some embodiments, the control system 108 includes a self-contained computer system, such as a standard commercially available single board computer. Typically, the control system 108 is configured to run a real time operating system along with a laser control software application. In other embodiments, the control system 108 is based on an embedded microcomputer or microcontroller and runs a laser control program. In still other embodiments, the control system 108 is based on an Application Specific Integrated Circuit (ASIC) or a programmed Field Programmable Gate Array (FPGA).


User inputs 110 include controls configured for a user to operate the laser system 100. These controls may be manual or electronic. For example, user inputs 110 may include a keyboard, one or more buttons, a touch screen, a dial, switches, and/or the like. The user inputs 110 are configured for turning a laser beam on, turning the laser beam off, selecting one or more characteristics of the laser beam, and the like.


The display 116 is typically a liquid crystal or light emitting diode display. In various embodiments, the display 116 is configured to display system states, e.g., shutdown states, of the laser system 100 to a user. The system states may include, for example, information regarding repetition rate, component temperature, pulse width, pulse energy, or the like. Shutdown states may also include a list of components that are shutdown, a list of components that are not shutdown, why components were shutdown, a list of interlock triggers, or the like.


External control interface 132 is configured to communicate commands and/or data to or from one or more systems external to laser system 100. For example, external control interface 132 may be configured to communicate with a robot, an external trigger, a remote control, or an external interlock. In some embodiments, external control interface 132 is configured to communicate using a network protocol, such as TCP/IP. In various embodiments, the external control interface 132 includes a hardwired connection such as a single wire, a pair of wires, a USB interface, an Ethernet network interface, a FireWire interface, an RS-232 interface, a GPIB interface, or the like. Alternatively, the external control interface 132 includes a wireless connection such as a WiFi connection, a Bluetooth connection, a ZigBee connection, or the like.


In various embodiments, the external control interface 132 is configured to communicate one or more external interlock control inputs and/or outputs. External interlock control inputs are configured for external control circuitry or external computer systems to activate the intelligent laser interlock system. For example, in some embodiments, a first external interlock control input is configured to receive a hardwired interlock trigger and a second external interlock control input is configured to receive an intelligent interlock trigger. In some embodiments, external interlock control outputs are configured to control external circuitry or computer systems in response to an interlock trigger. For example, an external interlock control output may be used to shutdown an external device in response to an intelligent interlock trigger.


The storage 114 is configured to store operating parameters, logs of events that occur in the laser system 100, snapshots of system states of the laser system 100, and/or the like. For example, in some embodiments, the storage 114 is configured to store a snapshot of the state of laser system 100 at the time an interlock trigger is received. The storage 114 may include volatile memory, non-volatile memory, a hard drive, an optical drive, or the like.


The control logic 112 includes logic configured to execute computing instructions. For example, control logic 112 may include a processor, an application specific integrated circuit, a field programmable gate array, or the like. As is described further herein, the computing instructions executed by the control logic 112 include those used to respond to intelligent interlock triggers. The control logic 112 also includes wiring, comparators, logic gates (e.g., simple NAND, OR, and AND gates), and the like configured to perform hardwired operations. These hardwired operations include those used to respond to hardwired interlock triggers.


The oscillator 106 comprises oscillator logic 122, oscillator electronics 126, oscillator optics 130, and an optional oscillator shutter 136. The control system 108 is configured to communicate with oscillator 106 through one or more connections 120. This communication may include the transmission of control signals and/or commands to the oscillator logic 122, and may include receipt of status information, such as temperature, beam characteristics, beam alignment, error conditions, and interlock triggers from oscillator electronics 126.


The oscillator logic 122 comprises circuitry configured to control and monitor the oscillator 106. For example, in various embodiments, the oscillator logic 122 receives a plurality of command and control data signals from the control system 108 via connections 120 and, in turn, generates appropriate signals to control the oscillator electronics 126. In addition, the oscillator logic 122 typically includes circuitry configured to monitor one or more components of oscillator 106, and provide appropriate signals back to the control system 108 via connections 120. These signals may include interlock triggers and/or data indicative of a state of the oscillator 106. Oscillator logic 122 is coupled to oscillator electronics 126 via connections 124.


The oscillator electronics 126 are configured to supply power to the oscillator optics 130, and may include for example power amplifiers, trigger signals, heater power supplies, laser diode inputs, and/or the like. The oscillator electronics 126 are also configured to generate signals representative of states of oscillator 106. For example, the oscillator electronics 126 may include a temperature sensor and transducer, a flow sensor, a photodetector, a position sensor, and/or the like. The oscillator electronics 126 are optionally configured to control the oscillator shutter 136. The oscillator electronics 126 are coupled to the oscillator optics 130 and the oscillator shutter 136 via connections 128.


The oscillator optics 130 are configured to generate light pulses. These laser light pulses may be characterized by a laser light pulse power, a temporal width, a repetition rate, and a wavelength distribution. The pulse power may be defined as an average optical power present in the laser beam per unit time, or a peak power present in a single light pulse. In some embodiments, the light pulses generated by the oscillator optics 130 are chirped light pulses. The oscillator optics 130 may include a ring laser, an optical oscillator, a Bragg fiber, a pulse stretcher, a fiber optic, an optical pump source, an optical switch, and/or the like.


The oscillator shutter 136 is configured to block optical path 134 such that light pulses generated by the oscillator optics 130 are prevented from reaching the amplifier 104. The oscillator shutter 136 may include a mechanical shutter or an optical switch.


The amplifier 104 is configured to amplify optical pulses received from the oscillator 106 via the optical path 134. Amplifier 104 comprises an amplifier logic 138, an amplifier electronics 142, an amplifier optics 146, an optional external interface 150, and an optional amplifier shutter 148. The control system 108 is configured to communicate data and/or commands to the amplifier logic 138 through connections 118, and is further configured to receive data such as status and error conditions from the amplifier logic 138 through the amplifier connections 118.


The amplifier logic 138 comprises circuitry configured to control and monitor the amplifier 104. For example, in various embodiments, the amplifier logic 138 receives a plurality of command and control data signals from the control system 108 via connections 118 and, in turn, generates appropriate signals to control the amplifier electronics 142. In addition, the amplifier logic 138 typically includes circuitry configured to monitor one or more components of amplifier 104, and provide appropriate signals back to the control system 108 via connections 118. These signals may include interlock triggers and/or data indicative of a state of amplifier 104. The amplifier logic 138 is coupled to the amplifier electronics 142 via connections 140.


The amplifier electronics 142 are configured to supply power to amplifier optics 146, and may include for example power amplifiers, trigger signals, heater power supplies, laser diode inputs, and/or the like. Amplifier electronics 142 are also configured to generate signals representative of states of amplifier 104. For example, amplifier electronics 142 may include a temperature sensor and transducer, a photodetector, a position sensor, and/or the like. Amplifier electronics 142 are optionally configured to control amplifier shutter 148. Amplifier electronics 142 are coupled to amplifier optics 146 and amplifier shutter 148 via connections 144.


The amplifier optics 146 are configured to amplify light pulses received from oscillator optics 130. In some embodiments, the light pulses generated by oscillator optics 130 are chirped light pulses and amplifier optics 146 includes optics, such as a Bragg fiber, configured to temporally compress the amplified pulse. The amplifier optics 146 may include fiber optics, free space optics, a thin film amplifier and/or a fiber amplifier. In various embodiments, the amplified pulse is less than 1 nanosecond, 3 picoseconds, or 900 femtoseconds in width. The amplified pulse is provided as laser beam output 102.


Amplifier shutter 148 is configured to block the laser beam output 102 such that light pulses amplified by amplifier optics 146 do not leave laser system 100. Amplifier shutter 148 may include a mechanical shutter or an optical switch.


In various embodiments, the amplifier 104 is configured to communicate with one or more external systems via the external interface 150. These external systems may include an external interlock, a robot, an external trigger, a remote control, or an external interlock. In various embodiments, the external interface 150 is configured to communicate one or more external interlock control inputs and/or outputs. For example, external interface 150 may be used to communicate a signal from intelligent interlock logic 290 to shutdown an external device, or may receive an intelligent interlock trigger from an external device.


In various embodiments, operation of the laser system 100 is subject to an intelligent interlock system. In some embodiments, the intelligent interlock system is configured to separately shut down oscillator 106 and amplifier 104 in response to hardwired and/or intelligent interlock triggers.



FIG. 2 is a block diagram of an intelligent laser interlock system generally designated 200, according to various embodiments of the invention. The intelligent laser interlock system 200 comprises a hardwired interlock module 210 and an intelligent interlock module 220. As is described further herein, components of the intelligent interlock system 200 may be distributed among the control system 108, the oscillator 106 and the amplifier 104. Typically, the hardwired interlock module 210 is configured to respond to conditions that require immediate and/or invariant response. For example, the hardwired interlock module 210 may be configured to respond to opening of a system cover by closing amplifier shutter 148 (FIG. 1). In some embodiments, it is desirable that this response be as quick as possible.


Relative to the hardwired interlock module 210, the intelligent interlock module 220 is typically configured to respond to conditions that require less immediate and/or more variant response. For example, the intelligent interlock module 220 may adjust the electrical power provided by amplifier electronics 142 or a laser pulse repetition rate in response to a temperature measurement.


As is described further herein, in some embodiments, both the hardwired interlock module 210 and the intelligent interlock module 220 are used to respond to the same condition. For example, if the system cover is opened the hardwired interlock module 210 may close the amplifier shutter 148 and the intelligent interlock module 220 may turn off high voltage circuits.


The hardwired interlock module 210 and intelligent interlock module 220 are each responsive to sensors 230. Sensors 230 are configured to detect a condition of laser system 100 such as a temperature, voltage level, coolant flow, position, light pulse characteristic, and/or the like. For example, in various embodiments, sensors 230 include a thermocouple, an analog to digital converter, a flow meter, position sensors, and photodiodes. Sensors 230 are configured to generate an electrical signal, such as a hi-low (e.g, TTL) logic signal, an analog signal, or a multi-bit digital signal. Some of sensors 230 may be dedicated to sending the generated electrical signal to hardwired interlock module 210, some of sensors 230 may be dedicated to sending the generated electrical signal to intelligent interlock module 220, and some of sensors 230 may send electrical signals to both interlock modules. Sensors 230 may be included in any part of laser system 100.


The hardwired interlock module 210 and intelligent interlock module 220 are both configured to control shutdown activators 260. The shutdown activators 260 may include relays configured to break electrical connections, enable/disable signals, analog signals, switchers, mechanical shutters and/or positioners, warning messages, and/or the like. The shutdown activators 260 may also include system control elements such as parts of oscillator logic 122 or amplifier logic 138 configured to control pulse repetition rates or output powers. For example, intelligent interlock module 220 may be configured to respond to a measured temperature by changing a pulse repetition rate.


The hardwired interlock module 210 includes an optional hardwired trigger logic 240 and a hardwired interlock logic 250. The hardwired trigger logic 240 is configured to receive an output of sensors 230 and determine if the output represents a state that requires generation of a hardwired interlock trigger. A hardwired interlock trigger is typically a binary signal (e.g., a hi-low signal) that indicates that an interlock should be activated. The hardwired trigger logic 240 may include simple logic gates, comparators, analog-to-digital converters, and/or the like. For example, in some embodiments, the hardwired trigger logic 240 is configured to receive an analog signal from a member of sensors 230 and to compare this signal to a threshold voltage provided by a hardwired limits 245. A hardwired interlock trigger may then be generated in response to this comparison. In another example, the outputs of several of sensors 230 may be processed through simple logic gates, to generate a hardwired interlock trigger.


Hardwired interlock triggers generated by the hardwired trigger logic 240 are provided to hardwired interlock logic 250. The hardwired trigger logic 240 is optionally in embodiments wherein the output of one of sensors 230 is communicated directly to hardwired interlock logic 250. For example, if sensors 230 generate a binary signal, then this signal may be used directly by hardwired interlock logic 250.


The hardwired interlock logic 250 is typically configured to receive a variety of different hardwired interlock triggers from hardwired trigger logic 240. For example, hardwired interlock logic 250 may be configured to receive different hardwired interlock triggers corresponding to different members of sensors 230. Hardwired interlock logic 250 includes circuits configured for controlling which of shutdown activators 260 are activated by different hardwired trigger logic 240. These circuits optionally include NAND gates, AND gates, OR gates, and/or the like. In some embodiments, hardwired interlock logic 250 includes a direct connection between hardwired trigger logic 240 or sensors 230 and a member of shutdown activators 260.


The communication of hardwired interlock triggers between hardwired trigger logic 240 and hardwired interlock logic 250 may be serial or parallel. In some embodiments, particular hardwired interlock triggers are identified by the electrical connection through which they are received. In some embodiments, there is a separate electrical connector between hardwired trigger logic 240 and hardwired interlock logic 250 for each possible hardwired interlock trigger.


The hardwired interlock logic 250 is optionally further configured to communicate signals to an intelligent interlock logic 290 included in intelligent interlock module 220. These signals are discussed further elsewhere herein.


In addition to intelligent interlock logic 290, intelligent interlock module 220 includes intelligent trigger logic 280. Intelligent trigger logic 280 is configured to receive signals from sensors 230 and determine if an intelligent interlock trigger should be generated. In some embodiments, the intelligent trigger logic 280 includes the same elements and features as the hardwired trigger logic 240. However, intelligent trigger logic 280 may further include a limits memory 285 configured to store electronically programmable thresholds. These electronically programmable thresholds may be configured by writing data to the intelligent trigger logic 280. For example, in some embodiments, the electronically programmable thresholds can be configured by entering data through the user inputs 110 or through external control interface 132.


In some embodiments, hardwired interlock module 210 includes direct electrical connections that connect the output of sensors 230 to shutdown activators 260. These direct electrical connections may be configured to communicate a response as quickly as possible.


The intelligent trigger logic 280 is configured to compare data stored in limits memory 285 with signals received from sensors 230 in order to determine whether or not an intelligent interlock trigger should be generated. The signals received from sensors 230 are optionally digitized prior to this comparison. An intelligent interlock trigger is a signal that indicates that an interlock should be activated. The intelligent interlock trigger may be a binary signal or a set of binary signals (e.g. a set of bits). For example, the intelligent interlock trigger may include one, two or more bytes of data. In one embodiment, the intelligent interlock trigger includes a first byte indicating the identity of the member of sensors 230 whose signal caused the intelligent interlock trigger. Additional bytes may include quantitative information regarding the signal. For example, a second byte may indicate how far a sensed temperature is above a temperature threshold. In some embodiments, intelligent trigger logic 280 is configured to compare received sensor signals with calculated values, such as a calculated calibration value. Some limits may be determined during operation of laser system 100. For example, minimum and maximum pulse energies may be entered by a user.


The intelligent interlock trigger generated by intelligent trigger logic 280 is received by intelligent interlock logic 290. Intelligent interlock logic 290 is configured to respond to the intelligent interlock trigger by executing computing instructions. These computing instructions may be embodied in hardware, firmware, or software stored on a computer readable medium. These computing instructions are also optionally reconfigurable. As such, the operation of intelligent interlock logic 290 can be customized. Intelligent interlock logic 290 optionally includes a processor and memory configured to execute and store computing instructions, respectively.


Because intelligent interlock logic 290 is capable of executing computing instructions, intelligent interlock logic 290 can respond to intelligent interlock triggers with operations that include conditional statements (e.g., IF, WHILE, UNTIL, CASE, etc.) and these statements may be dependent on comparisons (e.g., A>B, A=B, A≠B, etc.). Using these operations, intelligent interlock logic 290 may be configured to respond to an intelligent interlock trigger as a function of a state of the laser system 100. For example, intelligent interlock logic 290 may respond differently to a detected high temperature depending on a current laser pulse repetition rate.


In some embodiments, different responses to an intelligent interlock trigger are enabled as the laser system 100 is brought through a self-test and through a warm-up period. For example, during warm-up, temperatures, electrical conditions and optical parameters may be expected to drift by a greater amount than when the laser system 100 is fully warmed up. Thus, intelligent trigger logic 280 may be configured to use wider limits during the warm-up period and narrower limits following the warm-up period.


In some embodiments, limits used by intelligent trigger logic 280 are dependent on the state of laser system 100. For example, in a continuous pulses mode where pulses are produced nearly continuously at a high repetition rate (e.g., >500 kHz) the average power detected at an optical output sensor would be expected to be nearly constant. Therefore, limits related to an output power are applicable to monitoring system performance. However, in a triggered mode in which one pulse is generated in response to one trigger event, the laser system 100 may be on while there are longer periods between pulses. During these periods, observation of the output power is not indicative of the system performance and limits related to the output power would not be used.


Intelligent interlock logic 290 is optionally further configured to operate shutdown activators 260 so as to shut down laser system 100 to one or more intermediate shutdown states. By bringing laser system 100 to an intermediate shutdown state, rather than completely shutting down laser system 100, it may be possible to restore laser system 100 to a fully operational state more quickly. Intelligent interlock logic 290 is optionally configured to shut down parts of laser system 100 in a variety of alternative orders.


In some embodiments, intelligent interlock logic 290 is configured to shutdown laser system 100 to an intermediate shutdown state in which oscillator optics 130 are being used to generate laser pulses but amplifier optics 146 are not provided with power to amplify the generated laser pulses. In some embodiments, intelligent interlock logic 290 is configured to shut down dangerous parts (e.g., high voltages and high power pulse sources) of the laser system 100 in a first shutdown state, and to shut down safe (e.g., low power) parts of the laser system 100 in a second shutdown state.


In some embodiments, hardwired interlock module 210 is configured to shutdown laser system 100 from a fully operation state to a first intermediate shutdown state, and intelligent interlock module 220 is configured to determine whether or not laser system 100 should be shutdown from the first intermediate shutdown state to a second shutdown state or to a fully shutdown state. For example, in response to a signal from sensors 230, hardwired interlock module 210 may shutdown operation of amplifier 104 and send an interlock trigger from hardwired interlock logic 250 to intelligent interlock logic 290. The shutdown of amplifier 104 is an example of an intermediate shutdown state and is facilitated by the relatively rapid response of hardwired interlock module 210. Intelligent interlock module 220 is configured to respond to the interlock trigger received from hardwired interlock module 210 by identifying a state of laser system 100. This state may include operational characteristics of oscillator 106 as well as information indicating that the operation of amplifier 104 is already shutdown. Based on the received interlock trigger and the determined state, intelligent interlock logic 290 may then determine if the generation of laser pulses using oscillator optics 130 should be shutdown, or if amplifier 104 can be restarted without first shutting down amplifier 104.


In some embodiments, intelligent interlock system 200 is considered to store one or more snapshots of the state of laser system 100. These snapshots may reflect states of laser system 100 before, during, and/or after receipt of an interlock trigger. For example, in some embodiments, control system 108 is configured to periodically store a state of laser system 100 in Storage 114. This state may be updated, for example, every 0.5 or 1.0 seconds. When intelligent interlock trigger or hardwired interlock trigger is generated, control system 108 is configured to preserve (e.g., save) the stored state such that the stored state can be used for later analysis. In some embodiments, control system 108 is configured to store a state of laser system 100 while in an intermediate shutdown state. For example, laser system 100 may be changed from a fully operational state to a first intermediate state by shutting down all or part of amplifier 104. In the first intermediate state, a state of laser system 100 may be saved for later use, and then the laser system 100 may be shutdown from the first intermediate state to a second intermediate shutdown state. Another state of the laser system 100 is optionally saved at the second intermediate shutdown state.


Saved states of laser system 100 are optionally included in event logs exported by control system 108. For example, control system 108 may be configured to include system states and events in a log. This log may be exported through external control interface 132. The events included in the log may comprise, for example, activation and deactivation of components, a number and characteristics of laser pulses produced, interlock triggers, movement of alignment optics, and/or the like.


While hardwired interlock module 210 and intelligent interlock module 220 are illustrated as separate modules in FIG. 2, in alternative embodiments these modules may share components. For example, hardwired trigger logic 240 and intelligent trigger logic 280 may share circuits.



FIG. 3 illustrates methods of using intelligent interlock system 200, according to various embodiments. In these methods, the output of one or more of sensors 230 is used to generate both a hardwired interlock trigger and an intelligent interlock trigger. These two interlock triggers are processed using hardwired interlock logic 250 and intelligent interlock logic 290, respectively. As a result of this processing, laser system 100 is shut down to one or more different shutdown states.


More specifically, in a receive sensor output step 310 an output of sensors 230 is received by hardwired trigger logic 240. Typically, this output is received through a high speed connection, such as a direct wire. As is described elsewhere herein, the sensor output may include a temperature, a position, a flow, a characteristic of a laser pulse, and/or the like. The sensor output is optionally received by intelligent trigger logic 280 at approximately the same time as hardwired trigger logic 240.


In a generate hardwired trigger step 320, the received sensor output is used to generate a hardwired interlock trigger using hardwired trigger logic 240. In some embodiments, generation of the hardwired interlock trigger includes merely passing the received sensor signal to an output of hardwired trigger logic 240. For example, if the sensor output is a 0V to 5V signal generated by a system cover position sensor, then this signal may be used directly as a hardwired interlock trigger. In some embodiments, generation of the hardwired interlock trigger includes digitizing the received sensor signal, comparing the received sensor signal with a threshold, and/or passing the received sensor signal though simple logic gates. The generated hardwired interlock trigger is passed to hardwired interlock logic 250.


In a process hardwired trigger step 330, the hardwired interlock trigger provided to hardwired interlock logic 250 by hardwired trigger logic 240 is processed in order to control an appropriate member of shutdown activators 260. In some embodiments, a single hardwired interlock trigger may result in activation of more than one of shutdown activators 260. For example, one of shutdown activators 260 may be used to close oscillator shutter 136 while another of shutdown activators 260 may be used to disable part of amplifier electronics 142.


In some embodiments, the processing performed by hardwired interlock logic 250 in process hardwired trigger step 330 includes merely passing a received hardwired interlock trigger to an appropriate shutdown activator. For example, the 0V to 5V output of a system cover position sensor may be passed directly to a shutter control motor. In some embodiments, the hardwired interlock logic 250 is configured to activate several members of shutdown activators 260 in response to one hardwired interlock trigger. In some embodiments, the hardwired interlock 250 is configured to activate one of shutdown activators 260 in response to a logical combination of different hardwired interlock triggers.


Process hardwired trigger step 330 may also include communication of an interlock trigger from hardwired interlock logic 250 to intelligent interlock logic 290. This interlock trigger is treated as an intelligent interlock trigger by intelligent interlock logic 290 as, for example, is further described below with respect to a step 360.


In a shutdown step 340, all or part of laser system 100 is shutdown using one or more members of shutdown activators 260 in response to signals received from hardwired interlock logic 250. In some embodiments, parts of laser system 100 are shut down in a sequence from upstream components to downstream components. For example, amplifier optics 146 may be shut down before oscillator electronics 126. In some embodiments, hardwired interlock module 210 is configured to place laser system 100 in an intermediate shutdown state in which parts of amplifier 104 are shutdown while oscillator electronics 126 and/or oscillator optics 130 are still operational.


In an optional generate intelligent interlock trigger step 350 an intelligent interlock trigger is generated using intelligent trigger logic 280 in response to receiving a signal from one of sensors 230. Generate intelligent interlock trigger step 350 may include comparison of the received signal to a customizable threshold stored in limits memory 285. The generated intelligent interlock trigger may include a multi-bit data. Generate intelligent trigger step 350 is optionally performed in parallel with generate hardwired trigger step 320.


In a process intelligent trigger step 360, an intelligent interlock trigger is processed using intelligent interlock logic 290. The intelligent interlock trigger may be that generated in generate intelligent interlock trigger step 350 and/or an interlock trigger received from hardwired interlock logic in process hardwired trigger step 330. Process intelligent trigger step 360 and/or generate intelligent trigger step 350 are optionally performed in parallel with process hardwired trigger step 330.


The intelligent interlock trigger is processed by executing computing instructions. These computing instructions are optionally user customizable and may be configured to shutdown laser system 100 from a first intermediate shutdown state to another intermediate shutdown state or to a complete shutdown state. In some embodiments, these computing instructions are configured to differentiate between different types of intelligent interlock triggers and determine which intermediate shutdown state the laser system 100 should be placed in based on a determined type.


In some embodiments, the computing instructions are configured to analyze the intelligent interlock trigger and determine if the laser system 100 can be restored to a fully operational state from an intermediate shutdown state. In some embodiments, intelligent interlock logic 290 is configured to determine that an external device should be shut down by sending signals through external control interface 132 or external interface 150. In some embodiments, the computing instructions are configured to save one or more states of laser system 100 or send log information to an external device in response to an intelligent interlock trigger.


In a shutdown step 370, the state of laser system 100 is changed according to the processing of process intelligent trigger step 360. This change may include bringing the laser system 100 from a fully operational state to an intermediate shutdown state, from a first intermediate shutdown state to a second shutdown state, or from an intermediate shutdown to a complete shutdown state.



FIG. 4 illustrates methods of shutting down the laser system 100 into a plurality of shutdown states, according to various embodiments. In these methods, the system is placed in a first shutdown state in response to a hardwired interlock trigger and placed in a second shutdown state in response to an intelligent interlock trigger. One or more snapshots of the state of laser system 100 may also be saved in response to the interlock triggers.


Specifically, in a receive hardwired trigger step 410 hardwired interlock logic 250 receives and processes a hardwired interlock trigger. This interlock trigger is processed using hardwired logic as is described elsewhere herein. The results of the processing may include sending one or more signals to shutdown activators 260, sending an interlock trigger to intelligent interlock logic 290, saving a state of laser system 100, sending log data to one or more external devices, and/or the like.


In a shutdown step 420, the state of laser system 100 is changed using shutdown activators 260 in response to the processing of the hardwired interlock trigger in receive hardwired trigger step 410. This state change may include shutting down parts of amplifier 104 and/or parts of oscillator 106 in order to reach an intermediate shutdown state.


In a receive intelligent trigger step 430 an intelligent interlock trigger is received and processed by intelligent interlock logic 290. Receive intelligent trigger step 430 is optionally performed in parallel with receive hardwired trigger step 410 and/or shutdown step 420. The intelligent interlock trigger may be received from hardwired interlock logic 250 and/or intelligent trigger logic 280, or from an external device via external interface 150.


The intelligent interlock trigger is processed by executing computing instructions included within intelligent interlock logic 290. As is described elsewhere herein, these computing instructions may be user configurable.


In a shutdown step 440, the state of laser system 100 is changed for a second time based on the processing in receive intelligent trigger step 430. The second change in state may be from a first intermediate shutdown state to a second intermediate shutdown state, from the first intermediate shutdown state to a fully operational state, or from the first intermediate shutdown state to essentially completely shutdown state (e.g., a state in which neither oscillator optics 130 nor amplifier optics 146 are used to generate laser light.)


In an optional store snapshot step 450, one or more snapshots of states of laser system 100 are saved. Store snapshot step 450 may be performed several times in the methods illustrated by FIG. 4. For example, store snapshot step 450 may occur in response to receive hardwired trigger step 410, in parallel with shutdown step 420, in response to receive intelligent trigger step 430, in parallel with shutdown step 440, and/or after the completion of shutdown step 440. The snapshot stored in store snapshot step 450 may be a snapshot that was first saved prior to receive hardwired trigger step 410 and is stored on a more permanent basis in store snapshot step 450.


In an optional transmit snapshot step 460, the one or more snapshots stored in step 450 are transmitted from laser system 100 to an external device via external control interface 132. Transmit snapshot step 460 may also include transmitting an event log to the external device.


Several embodiments are specifically illustrated and/or described herein. However, it will be appreciated that modifications and variations are covered by the above teachings and within the scope of the appended claims without departing from the spirit and intended scope thereof. For example, systems and methods of the invention may include more than one of intelligent interlock module 200. One of intelligent interlock module 200 may be used to control more than one amplifier 104. Some laser system components that are described as being disposed within the oscillator 106 may be disposed within the control system 108 or within the amplifier 104 while being configured to perform an essentially similar function. Some laser system components that are described as being disposed within the amplifier 104 may be disposed within the control system 108 or within the oscillator 106 while being configured to perform an essentially similar function. In some embodiments, signals from external control interface 132 and/or external interface 150 are used as inputs to hardwired trigger logic 240 and/or intelligent trigger logic 280, in addition to or as an alternative to signals from sensors 230. The signals from external control interface 132 and external interface 150 may be used to generate hardwired interlock triggers and/or intelligent interlock triggers, as described elsewhere herein.


The embodiments discussed herein are illustrative of the present invention. As these embodiments of the present invention are described with reference to illustrations, various modifications or adaptations of the methods and or specific structures described may become apparent to those skilled in the art. All such modifications, adaptations, or variations that rely upon the teachings of the present invention, and through which these teachings have advanced the art, are considered to be within the spirit and scope of the present invention. Hence, these descriptions and drawings should not be considered in a limiting sense, as it is understood that the present invention is in no way limited to only the embodiments illustrated.

Claims
  • 1. A system comprising: a light source including an amplifier and an oscillator, the oscillator configured to generate a laser light pulse;the amplifier configured to receive the laser light pulse from the oscillator and amplify the laser light pulse;a first interlock module communicatively coupled with the oscillator and configured to shutdown a first component of the light source;a second interlock module communicatively coupled with the oscillator and configured to shutdown a second component of the light source by executing computing instructions; anda control system comprising an input configured to receive an interlock signal,an integrated circuit configured to select a shutdown state from a plurality of alternative shutdown states based on the interlock signal, andan output configured to place the system in the selected shutdown state.
  • 2. The system of claim 1, wherein one shutdown state includes shutting down the amplifier but not the oscillator.
  • 3. The system of claim 1, further including an external interface, said external interface being connected to an external system, wherein one shutdown state includes shutting down the external system by communicating a signal to the external system.
  • 4. The system of claim 1, wherein the control system is configured to control a plurality of oscillators.
  • 5. The system of claim 1, wherein the control system is configured to control a plurality of amplifiers.
  • 6. The system of claim 1, wherein the control system is configured to store a snapshot of a system state.
  • 7. The system of claim 1, wherein the control system is configured to communicate with an external computer system.
  • 8. The system of claim 1, wherein a duration of the laser light pulse is less than 1 nanosecond.
  • 9. The system of claim 1, wherein a duration of the laser light pulse is less than 3 picoseconds.
  • 10. A method comprising: receiving an output signal from a sensor at a first trigger logic of a first interlock module;generating a first interlock trigger using first trigger logic of the first interlock module;processing the first interlock trigger;changing a laser system to a first shutdown state responsive to the interlock signal processing of the first interlock trigger, the first shutdown state being an intermediate shutdown state;receiving and processing a second interlock trigger by second interlock logic;analyzing the interlock signal; andshutting down the laser system to a second shutdown state based on the processing of the second interlock trigger.
  • 11. The method of claim 10, wherein changing the laser system comprises shutting down one or more system components in a sequence from a downstream component to an upstream component.
  • 12. The method of claim 10, further comprising storing a snapshot of a system state.
  • 13. The method of claim 10, wherein changing the laser system to the first shutdown state includes halting the amplification of pulses, and changing the laser system to a second shutdown state includes halting the generation of laser pulses.
CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation of and claims the priority benefit of U.S. patent application Ser. No. 11/740,874 entitled “Intelligent Laser Interlock System,” filed Apr. 26, 2007 now U.S. Pat. No. 8,232,687, which claims the priority benefit of U.S. provisional application No. 60/796,646 entitled “Laser System Software Development Platform,” filed Apr. 26, 2006. The aforementioned disclosures are incorporated herein by reference.

US Referenced Citations (568)
Number Name Date Kind
2436662 Norgaard Feb 1948 A
3459960 Aaland et al. Aug 1969 A
3549256 Brienza et al. Dec 1970 A
3599019 Nannichi et al. Aug 1971 A
3602836 Young Aug 1971 A
3622907 Tomlinson et al. Nov 1971 A
3626318 Young Dec 1971 A
3628179 Cuff Dec 1971 A
3631362 Almasi et al. Dec 1971 A
3646469 Buczek et al. Feb 1972 A
3654624 Becker et al. Apr 1972 A
3696308 Duffy et al. Oct 1972 A
3735282 Gans May 1973 A
3764641 Ash Oct 1973 A
3806829 Duston et al. Apr 1974 A
3808549 Maurer Apr 1974 A
3851267 Tanner Nov 1974 A
3963953 Thornton, Jr. Jun 1976 A
4061427 Fletcher et al. Dec 1977 A
4194813 Benjamin et al. Mar 1980 A
4289378 Remy et al. Sep 1981 A
4389617 Kurnit Jun 1983 A
4394623 Kurnit Jul 1983 A
4449215 Reno May 1984 A
4590598 O'Harra, II May 1986 A
4622095 Grobman et al. Nov 1986 A
4655547 Heritage et al. Apr 1987 A
4673795 Ortiz, Jr. Jun 1987 A
4718418 L'Esperance, Jr. Jan 1988 A
4722591 Haffner Feb 1988 A
4730113 Edwards et al. Mar 1988 A
4750809 Kafka et al. Jun 1988 A
4808000 Pasciak Feb 1989 A
4815079 Snitzer et al. Mar 1989 A
4824598 Stokowski Apr 1989 A
4827125 Goldstein May 1989 A
4829529 Kafka May 1989 A
4835670 Adams et al. May 1989 A
4847846 Sone et al. Jul 1989 A
4848340 Bille et al. Jul 1989 A
4849036 Powell et al. Jul 1989 A
4856011 Shimada et al. Aug 1989 A
4878127 Zollman et al. Oct 1989 A
4902127 Byer et al. Feb 1990 A
4907586 Bille et al. Mar 1990 A
4913520 Kafka Apr 1990 A
4915757 Rando Apr 1990 A
4928316 Heritage et al. May 1990 A
4947398 Yasuda et al. Aug 1990 A
4950268 Rink Aug 1990 A
4972423 Alfano et al. Nov 1990 A
4983034 Spillman, Jr. Jan 1991 A
4988348 Bille Jan 1991 A
4994059 Kosa et al. Feb 1991 A
5010555 Madey et al. Apr 1991 A
5014290 Moore et al. May 1991 A
5022042 Bradley Jun 1991 A
5031236 Hodgkinson et al. Jul 1991 A
5043991 Bradley Aug 1991 A
5053171 Portney et al. Oct 1991 A
5095487 Meyerhofer et al. Mar 1992 A
5098426 Sklar et al. Mar 1992 A
5122439 Miersch et al. Jun 1992 A
5132996 Moore et al. Jul 1992 A
5146088 Kingham et al. Sep 1992 A
5154707 Rink et al. Oct 1992 A
5159402 Ortiz, Jr. Oct 1992 A
5162643 Currie Nov 1992 A
5166818 Chase et al. Nov 1992 A
5187759 DiGiovanni et al. Feb 1993 A
5194713 Egitto et al. Mar 1993 A
5204867 Koschmann Apr 1993 A
5206455 Williams et al. Apr 1993 A
5233182 Szabo et al. Aug 1993 A
5237576 DiGiovanni et al. Aug 1993 A
5255117 Cushman Oct 1993 A
5265107 Delfyett, Jr. Nov 1993 A
5267077 Blonder Nov 1993 A
5278853 Shirai et al. Jan 1994 A
5291501 Hanna Mar 1994 A
5293186 Seden et al. Mar 1994 A
5301347 Kensky Apr 1994 A
5302835 Bendett et al. Apr 1994 A
5309453 Treacy May 1994 A
5313262 Leonard May 1994 A
5315431 Masuda et al. May 1994 A
5315436 Lowenhar et al. May 1994 A
5329398 Lai et al. Jul 1994 A
5331131 Opdyke Jul 1994 A
5355383 Lockard Oct 1994 A
5367143 White, Jr. Nov 1994 A
5400350 Galvanauskas Mar 1995 A
5411918 Keible et al. May 1995 A
5414725 Fermann et al. May 1995 A
5418809 August, Jr. et al. May 1995 A
5428471 McDermott Jun 1995 A
5430572 DiGiovanni et al. Jul 1995 A
5440573 Fermann Aug 1995 A
5446813 Lee et al. Aug 1995 A
5450427 Fermann et al. Sep 1995 A
5479422 Fermann et al. Dec 1995 A
5489984 Hariharan et al. Feb 1996 A
5493579 Ressl et al. Feb 1996 A
5499134 Galvanauskas et al. Mar 1996 A
5517043 Ma et al. May 1996 A
5520679 Lin May 1996 A
5548098 Sugawara et al. Aug 1996 A
5572335 Stevens Nov 1996 A
5572358 Gabl et al. Nov 1996 A
5585642 Britton et al. Dec 1996 A
5585652 Kamasz et al. Dec 1996 A
5585913 Hariharan et al. Dec 1996 A
5590142 Shan Dec 1996 A
5592327 Gabl et al. Jan 1997 A
5596668 DiGiovanni et al. Jan 1997 A
5602673 Swan Feb 1997 A
5602677 Tournois Feb 1997 A
5615043 Plaessmann et al. Mar 1997 A
5617434 Tamura et al. Apr 1997 A
5624587 Otsuki et al. Apr 1997 A
5625544 Kowshik et al. Apr 1997 A
5627848 Fermann et al. May 1997 A
5631771 Swan May 1997 A
5633750 Nogiwa et al. May 1997 A
5633885 Galvanauskas et al. May 1997 A
5642447 Pan et al. Jun 1997 A
5644424 Backus et al. Jul 1997 A
5651018 Mehuys et al. Jul 1997 A
5656186 Mourou et al. Aug 1997 A
5657153 Endriz et al. Aug 1997 A
5661829 Zheng Aug 1997 A
5663731 Theodoras, II et al. Sep 1997 A
5665942 Williams et al. Sep 1997 A
5666722 Tamm et al. Sep 1997 A
5670067 Koide et al. Sep 1997 A
5677769 Bendett Oct 1997 A
5689361 Damen et al. Nov 1997 A
5689519 Fermann et al. Nov 1997 A
5694501 Alavie et al. Dec 1997 A
5696782 Harter et al. Dec 1997 A
5701319 Fermann Dec 1997 A
5703639 Farrier et al. Dec 1997 A
5708669 DiGiovanni et al. Jan 1998 A
5710424 Theodoras, II et al. Jan 1998 A
5720894 Neev et al. Feb 1998 A
5726855 Mourou et al. Mar 1998 A
5734762 Ho et al. Mar 1998 A
5736709 Neiheisel Apr 1998 A
5739933 Dembeck et al. Apr 1998 A
5770864 Dlugos Jun 1998 A
5771253 Chang-Hasnain et al. Jun 1998 A
5778016 Sucha et al. Jul 1998 A
5781289 Sabsabi et al. Jul 1998 A
5786117 Hoshi et al. Jul 1998 A
5788688 Bauer et al. Aug 1998 A
5790574 Rieger et al. Aug 1998 A
5815519 Aoshima et al. Sep 1998 A
5818630 Fermann et al. Oct 1998 A
5822097 Tournois Oct 1998 A
5835670 Hirayama et al. Nov 1998 A
5844149 Akiyoshi et al. Dec 1998 A
5847825 Alexander Dec 1998 A
5847863 Galvanauskas et al. Dec 1998 A
5862287 Stock et al. Jan 1999 A
5862845 Chin et al. Jan 1999 A
5867304 Galvanauskas et al. Feb 1999 A
5875408 Bendett et al. Feb 1999 A
5880823 Lu Mar 1999 A
5880877 Fermann et al. Mar 1999 A
5898485 Nati, Jr. Apr 1999 A
5907157 Yoshioka et al. May 1999 A
5920668 Uehara et al. Jul 1999 A
5923686 Fermann et al. Jul 1999 A
5929430 Yao et al. Jul 1999 A
5933271 Waarts et al. Aug 1999 A
5936716 Pinsukanjana et al. Aug 1999 A
5994667 Merdan et al. Nov 1999 A
5999847 Elstrom Dec 1999 A
6014249 Fermann et al. Jan 2000 A
6016452 Kasevich Jan 2000 A
6020591 Harter et al. Feb 2000 A
6034975 Harter et al. Mar 2000 A
6041020 Caron et al. Mar 2000 A
6061373 Brockman et al. May 2000 A
6069730 Injeyan et al. May 2000 A
6071276 Abela Jun 2000 A
6072811 Fermann et al. Jun 2000 A
6075588 Pinsukanjana et al. Jun 2000 A
6081369 Waarts et al. Jun 2000 A
6088153 Anthon et al. Jul 2000 A
6099522 Knopp et al. Aug 2000 A
6120857 Balooch et al. Sep 2000 A
6122097 Weston et al. Sep 2000 A
6130780 Joannopoulos et al. Oct 2000 A
6134003 Tearney et al. Oct 2000 A
6141140 Kim Oct 2000 A
6151338 Grubb et al. Nov 2000 A
6154310 Galvanauskas et al. Nov 2000 A
6156030 Neev Dec 2000 A
6161543 Cox et al. Dec 2000 A
6168590 Neev Jan 2001 B1
6172611 Hussain et al. Jan 2001 B1
6175437 Diels et al. Jan 2001 B1
6179421 Pang Jan 2001 B1
6181463 Galvanauskas et al. Jan 2001 B1
6190380 Abela Feb 2001 B1
6198568 Galvanauskas et al. Mar 2001 B1
6198766 Schuppe et al. Mar 2001 B1
6201914 Duguay et al. Mar 2001 B1
6208458 Galvanauskas et al. Mar 2001 B1
6228748 Anderson et al. May 2001 B1
6246816 Moore et al. Jun 2001 B1
6249630 Stock et al. Jun 2001 B1
6252892 Jiang et al. Jun 2001 B1
6256328 Delfyett et al. Jul 2001 B1
6269108 Tabirian et al. Jul 2001 B1
6271650 Massie et al. Aug 2001 B1
6275250 Sanders et al. Aug 2001 B1
6275512 Fermann Aug 2001 B1
6281471 Smart Aug 2001 B1
6290910 Chalk Sep 2001 B1
6303903 Liu Oct 2001 B1
6314115 Delfyett et al. Nov 2001 B1
6325792 Swinger et al. Dec 2001 B1
6327074 Bass et al. Dec 2001 B1
6327282 Hammons et al. Dec 2001 B2
6330383 Cai et al. Dec 2001 B1
6334011 Galvanauskas et al. Dec 2001 B1
6335821 Suzuki et al. Jan 2002 B1
6340806 Smart et al. Jan 2002 B1
RE37585 Mourou et al. Mar 2002 E
6355908 Tatah et al. Mar 2002 B1
6359681 Housand et al. Mar 2002 B1
6362454 Liu Mar 2002 B1
6365869 Swain et al. Apr 2002 B1
6366395 Drake et al. Apr 2002 B1
6370171 Horn et al. Apr 2002 B1
6370422 Richards-Kortum et al. Apr 2002 B1
6371469 Gray Apr 2002 B1
6396317 Roller et al. May 2002 B1
6400871 Minden Jun 2002 B1
6407363 Dunsky et al. Jun 2002 B2
6418154 Kneip et al. Jul 2002 B1
6418256 Danziger et al. Jul 2002 B1
6421169 Bonnedal et al. Jul 2002 B1
6425912 Knowlton Jul 2002 B1
6433303 Liu et al. Aug 2002 B1
6433305 Liu et al. Aug 2002 B1
6433760 Vaissie et al. Aug 2002 B1
6437283 Wiggermann et al. Aug 2002 B1
6463314 Haruna Oct 2002 B1
6482199 Neev Nov 2002 B1
6485413 Boppart et al. Nov 2002 B1
6486435 Beyer et al. Nov 2002 B1
6496099 Wang et al. Dec 2002 B2
6501590 Bass et al. Dec 2002 B2
6522460 Bonnedal et al. Feb 2003 B2
6522674 Niwano et al. Feb 2003 B1
6525873 Gerrish et al. Feb 2003 B2
6526085 Vogler et al. Feb 2003 B2
6526327 Kar et al. Feb 2003 B2
6529319 Youn et al. Mar 2003 B2
6541731 Mead et al. Apr 2003 B2
6547453 Stummer et al. Apr 2003 B1
6549547 Galvanauskas et al. Apr 2003 B2
6552301 Herman et al. Apr 2003 B2
6555781 Ngoi et al. Apr 2003 B2
6556733 Dy et al. Apr 2003 B2
6562698 Manor May 2003 B2
6567431 Tabirian et al. May 2003 B2
6570704 Palese May 2003 B2
6573813 Joannopoulos et al. Jun 2003 B1
6574024 Liu Jun 2003 B1
6574250 Sun et al. Jun 2003 B2
6576917 Silfvast Jun 2003 B1
6580553 Kim et al. Jun 2003 B2
6587488 Meissner et al. Jul 2003 B1
6592574 Shimmick et al. Jul 2003 B1
6597497 Wang et al. Jul 2003 B2
6603903 Tong et al. Aug 2003 B1
6603911 Fink et al. Aug 2003 B2
6608951 Goldenberg et al. Aug 2003 B1
6614565 Klug et al. Sep 2003 B1
6621040 Perry et al. Sep 2003 B1
6621045 Liu et al. Sep 2003 B1
6627421 Unger et al. Sep 2003 B1
6627844 Liu et al. Sep 2003 B2
6642477 Patel et al. Nov 2003 B1
6647031 Delfyett et al. Nov 2003 B2
6654161 Bass et al. Nov 2003 B2
6661568 Hollemann et al. Dec 2003 B2
6661816 Delfyett et al. Dec 2003 B2
6661820 Camilleri et al. Dec 2003 B1
6671298 Delfyett et al. Dec 2003 B1
6677552 Tulloch et al. Jan 2004 B1
6681079 Maroney Jan 2004 B1
6690686 Delfyett et al. Feb 2004 B2
6695835 Furuno et al. Feb 2004 B2
6696008 Brandinger Feb 2004 B2
6697402 Crawford Feb 2004 B2
6697408 Kennedy et al. Feb 2004 B2
6700094 Kuntze Mar 2004 B1
6700698 Scott Mar 2004 B1
6706036 Lai Mar 2004 B2
6706998 Cutler Mar 2004 B2
6710288 Liu et al. Mar 2004 B2
6710293 Liu et al. Mar 2004 B2
6711334 Szkopek et al. Mar 2004 B2
6716475 Fink et al. Apr 2004 B1
6720519 Liu et al. Apr 2004 B2
6723991 Sucha et al. Apr 2004 B1
6724508 Pierce et al. Apr 2004 B2
6727458 Smart Apr 2004 B2
6728273 Perry Apr 2004 B2
6728276 Shapiro et al. Apr 2004 B2
6728439 Weisberg et al. Apr 2004 B2
6735229 Delfyett et al. May 2004 B1
6735368 Parker et al. May 2004 B2
6738144 Dogariu May 2004 B1
6738408 Abedin May 2004 B2
6744552 Scalora et al. Jun 2004 B2
6744555 Galvanauskas et al. Jun 2004 B2
6747795 Lin et al. Jun 2004 B2
6749285 Liu et al. Jun 2004 B2
6760356 Erbert et al. Jul 2004 B2
6765724 Kramer Jul 2004 B1
6774869 Biocca et al. Aug 2004 B2
6782207 Efimov Aug 2004 B1
6785303 Holzwarth et al. Aug 2004 B1
6785445 Kuroda et al. Aug 2004 B2
6787733 Lubatschowski et al. Sep 2004 B2
6787734 Liu Sep 2004 B2
6788864 Ahmad et al. Sep 2004 B2
6791060 Dunsky et al. Sep 2004 B2
6791071 Woo et al. Sep 2004 B2
6795461 Blair et al. Sep 2004 B1
6801550 Snell et al. Oct 2004 B1
6801551 Delfyett et al. Oct 2004 B1
6801557 Liu Oct 2004 B2
6803539 Liu et al. Oct 2004 B2
6804574 Liu et al. Oct 2004 B2
6807353 Fleming et al. Oct 2004 B1
6807375 Dogariu Oct 2004 B2
6815638 Liu Nov 2004 B2
6819694 Jiang et al. Nov 2004 B2
6819702 Sverdlov et al. Nov 2004 B2
6819837 Li et al. Nov 2004 B2
6822187 Hermann et al. Nov 2004 B1
6822251 Arenberg et al. Nov 2004 B1
6824540 Lin Nov 2004 B1
6829517 Cheng et al. Dec 2004 B2
6834134 Brennan, III et al. Dec 2004 B2
6836703 Wang et al. Dec 2004 B2
6878900 Corkum et al. Apr 2005 B2
6882772 Lowery et al. Apr 2005 B1
6885683 Fermann et al. Apr 2005 B1
6887804 Sun et al. May 2005 B2
6897405 Cheng et al. May 2005 B2
6902561 Kurtz et al. Jun 2005 B2
6915040 Willner et al. Jul 2005 B2
6917631 Richardson et al. Jul 2005 B2
6928490 Bucholz et al. Aug 2005 B1
6937629 Perry et al. Aug 2005 B2
6943359 Vardeny et al. Sep 2005 B2
6956680 Morbieu et al. Oct 2005 B2
6994703 Wang et al. Feb 2006 B2
7001373 Clapham et al. Feb 2006 B2
7002733 Dagenais et al. Feb 2006 B2
7006730 Doerr Feb 2006 B2
7022119 Hohla Apr 2006 B2
7031571 Mihailov et al. Apr 2006 B2
7068408 Sakai Jun 2006 B2
7072101 Kapteyn et al. Jul 2006 B2
7088756 Fermann et al. Aug 2006 B2
7095772 Delfyett et al. Aug 2006 B1
7097640 Wang et al. Aug 2006 B2
7099549 Scheuer et al. Aug 2006 B2
7116688 Sauter et al. Oct 2006 B2
7132289 Kobayashi et al. Nov 2006 B2
7143769 Stoltz et al. Dec 2006 B2
7171074 DiGiovanni et al. Jan 2007 B2
7217266 Anderson et al. May 2007 B2
7220255 Lai May 2007 B2
7233607 Richardson et al. Jun 2007 B2
7257302 Fermann et al. Aug 2007 B2
7289707 Chavez-Pirson et al. Oct 2007 B1
7332234 Levinson et al. Feb 2008 B2
7349452 Brennan, III et al. Mar 2008 B2
7349589 Temelkuran et al. Mar 2008 B2
7361171 Stoltz et al. Apr 2008 B2
7367969 Stoltz et al. May 2008 B2
7413565 Wang et al. Aug 2008 B2
7414780 Fermann et al. Aug 2008 B2
7444049 Kim et al. Oct 2008 B1
7505196 Nati et al. Mar 2009 B2
7518788 Fermann et al. Apr 2009 B2
7584756 Zadoyan et al. Sep 2009 B2
7674719 Li et al. Mar 2010 B2
7675674 Bullington et al. Mar 2010 B2
7728967 Ochiai et al. Jun 2010 B2
7751118 Di Teodoro et al. Jul 2010 B1
7759607 Chism, II Jul 2010 B2
7773216 Cheng et al. Aug 2010 B2
7773294 Brunet et al. Aug 2010 B2
7787175 Brennan, III et al. Aug 2010 B1
7792408 Varming Sep 2010 B2
7822347 Brennan, III et al. Oct 2010 B1
7847213 Anikitchev Dec 2010 B1
7943533 Mizuno May 2011 B2
7963958 Stoltz et al. Jun 2011 B2
7998404 Huang et al. Aug 2011 B2
8232687 Stadler et al. Jul 2012 B2
RE43605 O'Brien et al. Aug 2012 E
8338746 Sun et al. Dec 2012 B2
8373090 Gale et al. Feb 2013 B2
20010009250 Herman et al. Jul 2001 A1
20010021294 Cai et al. Sep 2001 A1
20010046243 Schie Nov 2001 A1
20020003130 Sun et al. Jan 2002 A1
20020051606 Takushima et al. May 2002 A1
20020071454 Lin Jun 2002 A1
20020091325 Ostrovsky Jul 2002 A1
20020095142 Ming Jul 2002 A1
20020097468 Mecherle et al. Jul 2002 A1
20020097761 Sucha et al. Jul 2002 A1
20020115273 Chandra et al. Aug 2002 A1
20020118934 Danziger et al. Aug 2002 A1
20020153500 Fordahl et al. Oct 2002 A1
20020162973 Cordingley et al. Nov 2002 A1
20020167581 Cordingley et al. Nov 2002 A1
20020167974 Kennedy et al. Nov 2002 A1
20020176676 Johnson et al. Nov 2002 A1
20020186915 Yu et al. Dec 2002 A1
20020191901 Jensen Dec 2002 A1
20030011782 Tanno Jan 2003 A1
20030031410 Schnitzer Feb 2003 A1
20030039442 Bond et al. Feb 2003 A1
20030053508 Dane et al. Mar 2003 A1
20030055413 Altshuler et al. Mar 2003 A1
20030060808 Wilk Mar 2003 A1
20030086647 Willner et al. May 2003 A1
20030095266 Detalle et al. May 2003 A1
20030123496 Broutin et al. Jul 2003 A1
20030142705 Hackel et al. Jul 2003 A1
20030152115 Jiang et al. Aug 2003 A1
20030156605 Richardson et al. Aug 2003 A1
20030161365 Perry et al. Aug 2003 A1
20030161378 Zhang et al. Aug 2003 A1
20030178396 Naumov et al. Sep 2003 A1
20030189959 Erbert et al. Oct 2003 A1
20030202547 Fermann et al. Oct 2003 A1
20030205561 Iso Nov 2003 A1
20030214714 Zheng Nov 2003 A1
20030223689 Koch et al. Dec 2003 A1
20030235381 Hunt Dec 2003 A1
20040000942 Kapteyn et al. Jan 2004 A1
20040022695 Simon et al. Feb 2004 A1
20040037505 Morin Feb 2004 A1
20040042061 Islam et al. Mar 2004 A1
20040049552 Motoyama et al. Mar 2004 A1
20040101001 Bergmann et al. May 2004 A1
20040128081 Rabitz et al. Jul 2004 A1
20040134894 Gu et al. Jul 2004 A1
20040134896 Gu et al. Jul 2004 A1
20040160995 Sauter et al. Aug 2004 A1
20040182838 Das et al. Sep 2004 A1
20040226922 Flanagan Nov 2004 A1
20040226925 Gu et al. Nov 2004 A1
20040231682 Stoltz et al. Nov 2004 A1
20040233944 Dantus et al. Nov 2004 A1
20040263950 Fermann et al. Dec 2004 A1
20050008044 Fermann et al. Jan 2005 A1
20050018986 Argyros et al. Jan 2005 A1
20050035097 Stoltz Feb 2005 A1
20050036527 Khazaei et al. Feb 2005 A1
20050038487 Stoltz Feb 2005 A1
20050061779 Blumenfeld et al. Mar 2005 A1
20050065502 Stoltz Mar 2005 A1
20050067388 Sun et al. Mar 2005 A1
20050074974 Stoltz Apr 2005 A1
20050077275 Stoltz Apr 2005 A1
20050105865 Fermann et al. May 2005 A1
20050107773 Bergt et al. May 2005 A1
20050111073 Pan et al. May 2005 A1
20050111500 Harter et al. May 2005 A1
20050127049 Woeste et al. Jun 2005 A1
20050154380 DeBenedictis et al. Jul 2005 A1
20050163426 Fermann et al. Jul 2005 A1
20050167405 Stoltz et al. Aug 2005 A1
20050171516 Stoltz et al. Aug 2005 A1
20050171518 Stoltz et al. Aug 2005 A1
20050175280 Nicholson Aug 2005 A1
20050177143 Bullington et al. Aug 2005 A1
20050195726 Bullington et al. Sep 2005 A1
20050213630 Mielke et al. Sep 2005 A1
20050215985 Mielke et al. Sep 2005 A1
20050218122 Yamamoto et al. Oct 2005 A1
20050225846 Nati et al. Oct 2005 A1
20050226278 Gu et al. Oct 2005 A1
20050226286 Liu et al. Oct 2005 A1
20050226287 Shah et al. Oct 2005 A1
20050232560 Knight et al. Oct 2005 A1
20050238070 Imeshev et al. Oct 2005 A1
20050253482 Kapps et al. Nov 2005 A1
20050259944 Anderson et al. Nov 2005 A1
20050265407 Braun et al. Dec 2005 A1
20050271094 Miller et al. Dec 2005 A1
20050271340 Weisberg et al. Dec 2005 A1
20050274702 Deshi Dec 2005 A1
20060016891 Giebel et al. Jan 2006 A1
20060030951 Davlin et al. Feb 2006 A1
20060050750 Barty Mar 2006 A1
20060056480 Mielke et al. Mar 2006 A1
20060064079 Stoltz et al. Mar 2006 A1
20060067604 Bull et al. Mar 2006 A1
20060084957 Delfyett et al. Apr 2006 A1
20060091125 Li et al. May 2006 A1
20060093012 Singh et al. May 2006 A1
20060093265 Jia et al. May 2006 A1
20060120418 Harter et al. Jun 2006 A1
20060126679 Brennan et al. Jun 2006 A1
20060131288 Sun et al. Jun 2006 A1
20060159137 Shah Jul 2006 A1
20060187974 Dantus Aug 2006 A1
20060201983 Kusama et al. Sep 2006 A1
20060209908 Pedersen et al. Sep 2006 A1
20060210275 Vaissie et al. Sep 2006 A1
20060221449 Glebov et al. Oct 2006 A1
20060237397 Yamazaki et al. Oct 2006 A1
20060249816 Li et al. Nov 2006 A1
20060250025 Kitagawa et al. Nov 2006 A1
20060268949 Gohle et al. Nov 2006 A1
20070025728 Nakazawa et al. Feb 2007 A1
20070047965 Liu et al. Mar 2007 A1
20070064304 Brennan et al. Mar 2007 A1
20070098025 Hong et al. May 2007 A1
20070106416 Griffiths et al. May 2007 A1
20070121686 Vaissie et al. May 2007 A1
20070196048 Galvanauskas et al. Aug 2007 A1
20070229939 Brown et al. Oct 2007 A1
20070253455 Stadler et al. Nov 2007 A1
20070273960 Fermann et al. Nov 2007 A1
20080029152 Milshtein et al. Feb 2008 A1
20080050078 Digonnet et al. Feb 2008 A1
20080058781 Langeweyde et al. Mar 2008 A1
20080232407 Harter et al. Sep 2008 A1
20080240184 Cho et al. Oct 2008 A1
20080264910 Kashyap et al. Oct 2008 A1
20090020511 Kommera et al. Jan 2009 A1
20090219610 Mourou et al. Sep 2009 A1
20090244695 Marcinkevicius et al. Oct 2009 A1
20090245302 Baird et al. Oct 2009 A1
20090257464 Dantus et al. Oct 2009 A1
20090273828 Waarts et al. Nov 2009 A1
20090290151 Agrawal et al. Nov 2009 A1
20090297155 Weiner et al. Dec 2009 A1
20100013036 Carey Jan 2010 A1
20100032416 Jeong et al. Feb 2010 A1
20100040095 Mielke et al. Feb 2010 A1
20100089882 Tamura Apr 2010 A1
20100118899 Peng et al. May 2010 A1
20100142034 Wise et al. Jun 2010 A1
20100157418 Dong et al. Jun 2010 A1
20100181284 Lee et al. Jul 2010 A1
20100276405 Cho et al. Nov 2010 A1
20110069723 Dong et al. Mar 2011 A1
20140044139 Dong et al. Feb 2014 A1
20140140361 Jiang May 2014 A1
Foreign Referenced Citations (16)
Number Date Country
0214100 Mar 1987 EP
0691563 Jan 1996 EP
1462831 Sep 2004 EP
8171103 Jul 1996 JP
11189472 Jul 1999 JP
2003181661 Jul 2003 JP
2003344883 Dec 2003 JP
2005174993 Jun 2005 JP
WO9428972 Dec 1994 WO
WO2004105100 Dec 2004 WO
WO2004114473 Dec 2004 WO
WO2005018060 Feb 2005 WO
WO2005018061 Feb 2005 WO
WO2005018062 Feb 2005 WO
WO2005018063 Feb 2005 WO
WO2007034317 Mar 2007 WO
Non-Patent Literature Citations (76)
Entry
Agostinelli, J. et al., “Optical Pulse Shaping with a Grating Pair,” Applied Optics, vol. 18, No. 14, pp. 2500-2504, Jul. 15, 1979.
Anastassiou et al., “Photonic Bandgap Fibers Exploiting Omnidirectional Reflectivity Enable Flexible Delivery of Infrared Lasers for Tissue Cutting,” Proceedings of the SPIE—the International Society for Optical Engineering, SPIE, US, vol. 5317, No. 1, Jan. 1, 2004, pp. 29-38, XP002425586 ISSN: 0277-786X.
Benoit, G. et al., “Dynamic All-optical Tuning of Transverse Resonant Cavity Modes in Photonic Bandgap Fibers, ”Optics Letters, vol. 30, No. 13, Jul. 1, 2005, pp. 1620-1622.
Chen, L. et al., “Ultrashort Optical Pulse Interaction with Fibre Gratings and Device Applications,” 1997, Canaga, located at http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp04/mq29402.pfd.
Chen, X. et al., “Highly Birefringent Hollow-core Photonic Bandgap Fiber,” Optics Express, vol. 12, No. 16, Aug. 9, 2004, pp. 3888-3893.
Chen, Y. et al., “Dispersion-Managed Mode Locking”, Journal of the Optical Society of America B, Nov. 1999, pp. 1999-2004, vol. 16, No. 11, Optical Society of America.
Dasgupta, S. et al., “Design of Dispersion-Compensating Bragg Fiber with an Ultrahigh Figure of Merit,” Optics Letters, Aug. 1, 2005, vol. 30, No. 15, Optical Society of America.
De Matos et al., “Multi-kilowatt, Picosecond Pulses from an All-fiber Chirped Pulse Amplification System Using Air-core Photonic Bandgalp Fiber”, Lasers and Electro-optics, 2004, (CLEO), Conference on San Francisco, CA USA, May 20-21, 2004, Piscataway, NJ, USA, IEEE, vol. May 17, 2004, pp. 973-974, XP010745448 ISBN: 978-1-55752-777-6.
De Matos, C.J.S. et al., “All-fiber Chirped Pulse Amplification using Highly-dispersive Air-core Photonic Bandgap Fiber,” Nov. 3, 2003, Optics Express, pp. 2832-2837, vol. 11, No. 22.
Delfyett, P. et al., “Ultrafast Semiconductor Laser-Diode-Seeded Cr:LiSAF Rengerative Amplifier System”, Applied Optics, May 20, 1997, pp. 3375-3380, vol. 36, No. 15, Octoical Society of America.
Eggleton, et al., “Electrically Tunable Power Efficient Dispersion Compensating Fiber Bragg Grating,” IEEE Photonics Technology Letters, vol., 11, No. 7, pp. 854-856, Jul. 1999.
Engeness et al., “Dispersion Tailoring and Compensation by Modal Interations in Omniguide Fibers,” Optics Express, May 19, 2003, pp. 1175-1196, vol. 11, No. 10.
Fink et al., “Guiding Optical Light in Air Using an All-Dielectric Structure,” Journal of Lightwave Technology, Nov. 1999, pp. 2039-2041, vol. 17, No. 11.
Folkenberg, J.R., et al., “Broadband Single-polarization Photonic Crystal Fiber,” Optics Letters, vol. 30, No. 12, Jun. 15, 2005, pp. 1446-1448.
Folkenberg, J.R., et al., “Polarization Maintaining Large Mode Area Photonic Crystal Fiber,” Optics Express vol. 12, No. 5, Mar. 8, 2004, pp. 956-960.
Futami, F., et al., “Wideband Fibre Dispersion Equalisation up to Fourth-order for Long-distance Sub-picosecond Optical Pulse Transmission,” Electronics Letters, vol. 35, No. 25, Dec. 9, 1999.
Galvanauskas, A. et al., “Chirped-pulse-amplification Circuits for Fiber Amplifiers, Based on Chirped-period Quasi-phase, matching gratings”, Optics Letters, Nov. 1, 1998, p. 1695-1697, vol. 23, No. 21, Optical Society of America.
Hartl et al., “In-line high energy Yb Fiber Laser Based Chirped Pulse Amplifier System”, Laser and Electro-Optics, 2004, (CLEO) Conference of San Francisco, CA USA May 20-21, 2004, Piscataway, NJ, USA, IEEE, vol. 1, May 17, 2004, pp. 563-565, XP010745382, ISBN: 978-1-55752-777-6.
Hellstrom, E. et al., “Third-order Dispersion Compensation Using a Phase Modulator”, Journal of Lightwave Technology, vol. 21, No. 5, pp. 1188-1197, May 2003.
Heritage, J. P. et al., “Picosecond Pulse Shaping by Spectral Phase and Amplitude Manipulation,” Optics Letters, vol. 10, No. 12, pp. 609-611, Dec. 1985.
Heritage, J.P. et al., “Spectral Windowing of Frequency-Modulated Optical Pulses in a Grating Compressor,” Applied Physics Letters, vol. 47, No. 2, pp. 87-89, Jul. 15, 1985.
Hill, K. et al., “Fiber Bragg Grating Technology Fundamentals and Overview,” Journal of Lightwave Technology, Aug. 1997, vol. 15, No. 8, pp. 1263-1276.
Ibanescu et al., “Analysis of Mode Structure in Hollow Dielctric Waveguide Fibers, ”Physical Review E 67, 2003, The American Physical Society.
Jiang, et al., “Fully Dispersion Compensated ˜500 fs Pulse Transmission Over 50 km Single Mode Fiber,” Optics Letters, vol. 30, No. 12, pp. 1449-1451, Jun. 15, 2005.
Jiang, et al., “Fully Dispersion Compensated ˜500 fs Pulse Transmission Over 50 km Single Mode Fiber,” Purdue University ECE Annual Research Summary, Jul. 1, 2004-Jun. 30, 2005.
Killey, et al., “Electronic Dispersion Compensation by Signal Predistortion Using Digital Processing and a Dual-Drive Mach-Zehnder Modulator,” IEEE Photonics Technology Letters, vol. 17, No. 3, pp. 714-716, Mar. 2005.
Kim, K. et al., “1.4kW High Peak Power Generation from an All Semiconductor Mode-locked Master Oscillator Power Amplifier System Based on eXtreme Chirped Pulse Amplification (X-CPA)”, Optics Express, Jun. 2, 2005, pp. 4600-4606, vol. 13, No. 12.
Koechner, “Solid State Laser Engineering”, Oct. 29, 1999, Section 5.5, pp. 270-277, 5th Edition, Springer.
Kwon, et al., “Tunable Dispersion Slope Compensator Using a Chirped Fiber Bragg Grating Tuned by a Fan-shaped Thin Metallic Heat Channel,” IEEE Photonics Technology Letters, vol. 18, No. 1, pp. 118-120, Jan. 1, 2006.
Kyungbum, Kim et al., “1.4kW High Peak Power Generation from an all Semiconductor Mode-locked Master Oscillator Power Amplifier System Based on eXtreme Chirped Pulse Amplification (X-CPA)”, Optics Express, Jun. 2, 2005, pp. 4600-4606, vol. 13, No. 12.
Levy et al., “Engineering Space-Variant Inhomogeneous Media for Polarization Control,” Optics Letters, Aug. 1, 2004, pp. 1718-1720, vol. 29, No. 15, Optical Society of America.
Liao, Kai-Hsiu et al., “Large-aperture Chirped Volume Bragg Grating Based Fiber CPA System, ”Optics Express, Apr. 16, 2007, vol. 15, No. 8, pp. 4876-4882.
Limpert et al., “All Fiber Chiped-Pulse Amplification System Based on Compression in Air-Guiding Photonic Bandgap Fiber”, Optics Express, Dec. 1, 2003, vol. 11, No. 24, pp. 3332-3337.
Lo, S. et al., “Semiconductor Hollow Optical Waveguides Formed by Omni-directional Reflectors”, Optics Express, vol. 12, No. 26, Dec. 27, 2004, pp. 6589-6593.
Malinowski A. et al., “Short Pulse High Power Fiber Laser Systems,” Proceedings of the 2005 Conference on Lasers and Electro-Optics (CLEO), Paper No. CThG3, pp. 1647-1649, May 26, 2005.
Mehier-Humbert, S. et al., “Physical Methods for Gene Transfer: Improving the Kinetics of Gene Delivery Into Cells,” Advanced Drug Delivery Reviews, vol. 57, pp. 733-753, 2005.
Mohammed, W. et al., “Selective Excitation of the TE01 Mode in Hollow-Glass Waveguide Using a Subwavelength Grating,” IEEE Photonics Technology Letters, Jul. 2005, vol. 17, No. 7, IEEE.
Nibbering, E.T.J., et al. “Spectral Determination of the Amplitude and the Phase of Intense Ultrashort Optical Pulses,” Journal Optical Society of America B, vol. 13, No. 2, pp. 317-329, Feb. 1996.
Nicholson, J. et al., “Propagation of Femotsecond Pulses in Large-mode-area, Higher-order-mode Fiber,” Optics Letters, vol. 31, No. 21, 2005, pp. 3191-3193.
Nishimura et al., “In Vivo Manipulation of Biological Systems with Femtosecond Laser Pulses,” Proc. SPIE 6261, 62611J, pp. 1-10, 2006.
Noda, J. et al., “Polarization-maintaining Fibers and Their Applications”, Journal of Lightwave Technology, vol. Lt-4, No. 8 Aug. 1986, pp. 1071-1089.
Palfrey et al., “Generation of 16-FSEC Frequency-tunable Pulses by Optical Pulse compression” Optics Letters, OSA, Optical Society of america, Washington, DC, USA, vol. 10, No. 11, Nov. 1, 1985, pp. 562-564, XP000710358 ISSN: 0146-9592.
Pelusi, M. et al., “Electrooptic Phase Modulation of Stretched 250-fs Pulses for Suppression of Third-Order Fiber Disperson in Transmission”, IEEE Photonics Technology Letters, vol. 11, No. 11, Nov. 1999, pp. 1461-1463.
Pelusi, M. D., et al., “Phase Modulation of Stretched Optical Pulses for Suppression of Third-order Dispersion Effects in fibre Transmission,” Electronics Letters, vol. 34, No. 17, pp. 1675-1677, Aug. 20, 1998.
Price et al., “Advances in High Power, Short Pulse, Fiber Laser Systems and Technology”, Photonics West 2005, San Jose, California, Jan. 2005, pp. 5709-3720.
Price et al., “Advances in High Power, Short Pulse, Fiber Laser Systems and Technology”, Proceedings of SPIE—vol. 5709, Fiber Lasers II: Technology, Systems, and Applications, Apr. 2005, pp. 184-192.
Ramachandran, S., et al., “High-power Amplification in a 2040-μm2 Higher Order Mode,” SPIE Photonics West 2007, Post-deadline.
Resan et al., “Dispersion-Managed Semiconductor Mode-Locked Ring Laser”, Optics Letters, Aug. 1, 2003, pp. 1371-1373, vol. 28, No. 15, Optical Society of America.
Schreiber, T., et al., “Design and High Power Operation of a Stress-induced single Polarization Single-transverse Mode LMA Yb-doped Photonic Crystal Fiber,” Fiber Lasers III: Technology, Systems, and Applications, Andrew J.W. Brown, Johan Nilsson, Donald J. Harter, Andreas Tunnermann, eds., Proc. of SPIE, vol. 6102, pp. 61020C-1-61020C-9, 2006.
Schreiber, T., et al., “Stress-induced Single-polarization Single-transverse Mode Photonic Crystal Fiber with Low Nonlinearity,” Optics Express, vol. 13, No. 19, Sep. 19, 2005, pp. 7621-7630.
Siegman, “Unstable Optical Resonators”, Applied Optics, Feb. 1974, pp. 353-367, vol. 13, No. 2.
Stevenson et al., Femtosecond Optical Transfection of Cells: Viability and Efficiency, Optics Express, vol. 14, No. 16, pp. 7125-7133, Aug. 7, 2006.
Stock et al., “Chirped Pulse Amplification in an Erbium-doped fiber Oscillator/Erbium-doped Fiber Amplifier System”, Optics Communications, North-Holland Publishing Co., Amsterdam, NL, vol. 106, No. 4/5/06, Mar. 15, 1994, pp. 249-252, XP000429901, ISSN: 0030-4018.
Strickland et al., “Compression of Amplified Chirped Optical Pulses”, Optics Communications, North-Holland Publishing Co., Amersterdam, NL, vol. 56, No. 3, Dec. 1, 1985, pp. 219-221, XP024444933 ISSN: 0030-4018 (retrieved on 1985-12-011.
Temelkuran, B. et al., “Wavelength-scalable Hollow Optical Fibres with Large Photonic Bandgaps for CO2 Laser Transmission,” Nature, Dec. 12, 2002, pp. 650-653.
Thurston, R.N. et al., “Analysis of Picosecond Pulse Shape Synthesis by Spectral Masking in a Grating Pulse Compressor,” IEEE Journal of Quantum Electronics, vol. EQ-22, No. 5, pp. 682-696, May 1986.
Tirlapur et al., “Targeted Transfection by Femtosecond Laser,” Nature Publishing Group, vol. 418, pp. 290-291, Jul. 18, 2002.
Tsai et al., “Ultrashort Pulsed Laser Light,” Optics & Photonics News, pp. 25-29, Jul. 2004.
Vaissie et al., “Desktop Ultra-Short Pulse Laser at 1552 nm,”Ultrashort Pulse Laser Materials Interaction Workshop (Raydiance)—Directed Energy Professional Society (DEPS), Sep. 28, 2006.
Weiner, A.M. et al., “Synthesis of Phase-coherent, Picosecond Optical Square Pulses,” Optics Letters, vol. 11, No. 3, pp. 153-155, Mar. 1986.
Weiner, A.M., “Femtosecond Optical Pulse Shaping and Processing,” Prog. Quant. Electr. 1995, vol. 19, pp. 161-237, 1995.
Weiner, A.M., “High-resolution femtosecond Pulse Shaping,” Journal of the Optical Society of America B. vol. 5, No. 8, pp. 1563-1572, Aug. 1988.
Wells, D.J., “Gene Therapy Progress and Prospects: electroporation and Other Physical Methods,” Gene Therapy, Nature Publishing Group, vol. 11, pp. 1363-1369, Aug. 5, 2004, (http://www.nature.com/gt).
White, W.E., et al., “Compensation of Higher-order Frequency-dependent Phase Terms in Chirped-pulse Amplification Systems,” Optics Letters, vol. 18, No. 16, pp. 1343-1345, Aug. 15, 1993.
Yamakawa et al., “1 Hz, 1 ps, terawatt Nd: glass laser”, Optics Communications, North-Holland Publishing Co. Amsterdam, NL, vol. 112, No. 1-2, Nov. 1, 1994, pp. 37-42, XP024424285.
Yan et al., Ultrashort Pulse Measurement Using Interferometric Autocorrelator Based on Two-photon-absorbtion Detector at 1.55μm Wavelength Region., 2005, Proceedings of SPIE vol. 5633, Advanced Materials and Devices for Sensing and Imaging II, pp. 424-429.
Yeh, et al. “Theory of Bragg Fiber”, Journal of the Optical Society America, Sep. 1978, pp. 1196, vol. 68, No. 9., pp. 1196-1201.
Yi, Y. et al., “Sharp Bending of On-Chip silicon Bragg Cladding Waveguide With Light Guiding on Low Index Core Materials”, IEEE Journal of Selected Topics in Quantum Electronics, vol. 12, No. 6, Nov./Dec. 2006, pp. 1345-1348.
Yi, Y., et al., “On-chip Si-based Bragg Cladding Waveguide with High Index Contrast Bilayers”, Optics Express, vol. 12, No. 20, Oct. 4, 2004, pp. 4775-4780.
Yin, D. et al., “Integrated Arrow Waveguides with Hollow Cores”, Optics Express, vol. 12, No. 12, Jun. 14, 2004, pp. 2710-2715.
Zhou, S. et al., “Compensation of nonlinear Phase Shifts with Third-order Dispersion in Short-pulse Fiber Amplifiers,” Optics Express, vol. 13, No. 13, pp. 4869-2877, Jun. 27, 2005.
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Notice of Allowance received for U.S. Appl. No. 11/740,874, mailed on Mar. 29, 2012, 7 pages.
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