System and method for recording and reproducing holographic interferogram with optical servo

Abstract

A system and method for recording and reproducing holographic interferogram with servo is provided. A servo process is provided by the system and method to continuously recording a holographic interferogram in a holographic recording medium with servo trace layers. By the servo process, reproducing signals are captured rapidly and correctly. Also, by the servo process, the intensity distribution of a reference beam is monitored, which is reflected by a reflecting mirror disposed on the other side of the holographic recording medium and transmits the holographic recording medium. By analyzing the distribution, one can adjust the distance and the incidence angle between the reflection mirror and the reference beam. Moreover, a plurality of servo tracks at different layer is provided for recording the holographic interferogram at different layers of holographic recording medium.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

The present invention will become more fully understood from the detailed description given herein below for illustration only, and which thus is not limitative of the present invention, and wherein:

FIG. 1A is a schematic view of the combination of the first embodiment of the present invention.

FIG. 1B is a schematic view of the reproduction of the first embodiment of the present invention.

FIG. 2 is a schematic view of the holographic storage media of the present invention.

FIG. 3 is a schematic view of the combination of the second embodiment of the present invention.

FIG. 4 is a schematic view of the combination of the third embodiment of the present invention.

FIG. 5A is a schematic view of the combination of the fourth embodiment of the present invention.

FIG. 5B is a schematic view of the reproduction of the fourth embodiment of the present invention.

FIG. 6A is a schematic view of the combination of the fifth embodiment of the present invention.

FIG. 6B is a schematic view of the reproduction of the fifth embodiment of the present invention.

FIG. 7 is a schematic view of the combination of the sixth embodiment of the present invention.

FIG. 8A is a schematic view of the combination of the seventh embodiment of the present invention.

FIG. 8B is a schematic view of the reproduction of the seventh embodiment of the present invention.

FIG. 9 is a schematic view of the combination of the eighth embodiment of the present invention.

FIG. 10 is a schematic view of the combination of the ninth embodiment of the present invention.

FIG. 11 is a schematic view of the interference of the signal beam and the reference beam of the ninth embodiment of the present invention.

FIG. 12A is a schematic view of the combination of the tenth embodiment of the present invention.

FIG. 12B is a schematic view of the reproduction of the tenth embodiment of the present invention.

FIG. 13 is a schematic view of the combination of the eleventh embodiment of the present invention.

FIG. 14 is a schematic view of the combination of the twelfth embodiment of the present invention.

FIG. 15 is a schematic view of the combination of the thirteenth embodiment of the present invention.

FIG. 16 is a schematic view of the combination of the fourteenth embodiment of the present invention.

FIG. 17 is a schematic view of the combination of the fifteenth embodiment of the present invention.

FIG. 18A is a schematic view of the combination of the sixteenth embodiment of the present invention.

FIG. 18B is a schematic view of the reproduction of the sixteenth embodiment of the present invention.

FIG. 19 is a schematic view of the interference of the signal beam and the reference beam of the sixteenth embodiment of the present invention.

FIG. 20 is a schematic view of the combination of the seventeenth embodiment of the present invention.

FIG. 21 is a schematic view of the interference of the signal beam and the reference beam of the seventeenth embodiment of the present invention.

FIGS. 22, 23, 24 and 25 are flow charts of the method of the present invention.

Claims

1. A system for recording and reproducing holographic storage with optical servo, for adopting a holographic storage media, which comprising: a light source, generating a signal beam and a reference beam, wherein the reference beam is projected to the holographic storage media in a first incidence direction;a spatial light modulator, located on the path of the signal beam, such that the signal beam is projected to the holographic storage media in a second incidence direction after being projected to the spatial light modulator, and interferes with the reference beam to generate a holographic interferogram in the holographic storage media;wherein when the reference beam is projected to the holographic interferogram in the first incidence direction again, a reproducing beam is generated and is projected to an image sensor on the path which the signal beam travels;a servo beam guiding portion, guiding the reference beam pass through the holographic storage media and guided to a sensing portion after being reflected by a reflecting mirror, for analyzing and adjusting the distance and the included angle between the reflecting mirror and the reference beam by moving the reflective mirror; anda servo light source, generating a servo beam, wherein the servo beam is projected to a servo track of the holographic storage media through the servo beam guiding portion, and is reflected by the servo track and received by the sensing portion, such that the reference beam is adjusted to be projected to the holographic storage media in the first incidence direction, and the holographic interferogram is continuously recorded in the holographic storage media along the servo track.

2. The system for recording and reproducing holographic storage with optical servo as claimed in claim 1, further comprising a first light guiding portion and a second light guiding portion, wherein the first light guiding portion is disposed in front of the light source, such that the light generated by the light source, after passing through the first light guiding portion, is split into the signal beam and the reference beam, and the reference beam is projected to the holographic storage media in the first incidence direction through the first light guiding portion; and the second light guiding portion guides the signal beam to be projected to the spatial light modulator and then projected to the holographic storage media in the second incidence direction.

3. The system for recording and reproducing holographic storage with optical servo as claimed in claim 2, wherein the first light guiding portion comprises: a polarizing film, disposed in front of the light source, such that the light projected by the light source is converted to a linear polarization light after passing through the polarizing film;a splitter, for splitting the linear polarization light projected to the splitter into the signal beam and the reference beam, wherein the reference beam is projected to the holographic storage media in the first incidence direction;an objective lens, for converging the reference beam and then projected to the holographic storage media; and

4. The system for recording and reproducing holographic storage with optical servo as claimed in claim 3, wherein the first light guiding portion further comprises a second objective lens, and the second objective lens includes: a first lens; anda second lens with a focus coinciding with a focus of the first lens, and having a focal length shorter than that of the first lens, such that the diameter of the reference beam generated by the splitter is reduced.

5. The system for recording and reproducing holographic storage with optical servo as claimed in claim 3, wherein the first light guiding portion further comprises: a first phase delay film, disposed on one side of the splitter, such that the reference beam is projected to the first phase delay film and the polarization of the reference beam is converted; anda reflecting mirror with a third phase delay film adhered to one side of the reflecting mirror, wherein the reference beam passes through the holographic storage media and is projected to the third phase delay film, and is reflected by the reflecting mirror to pass through the third phase delay film again, such that the polarization of the reference beam is converted, and the reference beam, after being projected to the splitter, is projected to the sensing portion, and for analyzing and adjusting the distance and the included angle between the reflecting mirror and the reference beam; and

6. The system for recording and reproducing holographic storage with optical servo as claimed in claim 5, wherein the servo beam guiding portion comprises: a servo beam reflecting mirror set, for reflecting the servo beam to the objective lens to be converged, and then to be projected to the holographic storage media, wherein the servo beam focuses on a servo track of the holographic storage media, and is reflected by a wavelength selection film coated on the servo track, and then is projected to the sensing portion through the servo beam reflecting mirror set, such that the servo beam is converted to an electrical signal transmitted to a controlling device, wherein the optical axis of the objective lens is adjusted to be perpendicular to the servo track surface of the holographic storage media by the controlling device, and the reference beam is adjusted to be projected to the holographic storage media in the first incidence direction, and the holographic interferogram is continuously recorded in the holographic storage media along the servo track.

7. The system for recording and reproducing holographic storage with optical servo as claimed in claim 5, wherein the first light guiding portion further comprises a second objective lens, and the second objective lens includes: a first lens; anda second lens, with a focus coinciding with a focus of the first lens, and having the focal length shorter than that of the first lens, such that the beam diameter of the reference beam generated by the splitter is further reduced.

8. The system for recording and reproducing holographic storage with optical servo as claimed in claim 3, wherein the first light guiding portion further comprises: a first phase delay film, disposed on one side of the splitter, such that the polarization of reference beam is converted after being projected to the first phase delay film;a reflecting mirror with a third phase delay film adhered to one side of the reflecting mirror, wherein the reference beam passes through the holographic storage media and is projected to the third phase delay film, and is reflected by the reflecting mirror to pass through the third phase delay film again, such that the polarization of the reference beam is converted, and then the reference beam, after being projected to the splitter, is projected to the sensing portion, and thus the distance and the included angle between holographic storage media and the reference beam is analyzed and adjusted; andthe second light guiding portion further comprises: a first reflecting mirror, for projecting the signal beam to the spatial light modulator, wherein the signal beam, after the polarization thereof is converted by the spatial light modulator, is reflected by spatial light modulator;a first polarizing splitter, disposed on the path of the signal beam, wherein the signal beam reflected by the spatial light modulator is projected to the first polarizing splitter and a part of the signal beam with the polarization same as the reference beam is reflected by the first polarizing splitter; the signal beam is then projected to the lenses and the reflecting mirror sets to be projected to the holographic storage media in the second incidence direction, such that the polarization of the signal beam is the same as that of the reference beam, and the signal beam and the reference beam interfere with each other in the holographic storage media to generate the holographic interferogram in the holographic storage media;wherein when the reference beam passing through the first phase delay film is projected to the holographic interferogram, a reproducing beam is generated and travels back along the path of the signal beam, and passes through the first polarizing splitter via the lenses and the reflecting mirror sets; andthe image sensor is a two-dimensional image sensor disposed on one side of the first polarizing splitter to receive the reproducing beam reflected by the first polarizing splitter.

9. The system for recording and reproducing holographic storage with optical servo as claimed in claim 8, wherein the servo beam guiding portion comprises: a servo beam reflecting mirror set, for reflecting the servo beam to the objective lens to be converged, and then to be projected to the holographic storage media, wherein the servo beam passes through a wavelength selection film of the holographic storage media, and is projected to a servo track of the holographic storage media, and is reflected by the servo track to the sensing portion through the servo beam reflecting mirror set, such that the servo beam is converted to an electrical signal transmitted to the controlling device, wherein the optical axis of the objective lens is adjusted to be perpendicular to the servo track surface of the holographic storage media by the controlling device, and the reference beam is adjusted to be projected to the holographic storage media in the first incidence direction, and the holographic interferogram is continuously recorded in the holographic storage media along the servo track.

10. The system for recording and reproducing holographic storage with optical servo as claimed in claim 8, wherein the spatial light modulator is a reflective spatial light modulator.

11. The system for recording and reproducing holographic storage with optical servo as claimed in claim 8, wherein the first light guiding portion further comprises a second objective lens, and the second objective lens includes: a first lens; anda second lens, with a focus thereof coinciding with a focus of the first lens, and having a focal length shorter than that of the first lens, such that the diameter of the reference beam generated by the splitter is reduced.

12. The system for recording and reproducing holographic storage with optical servo as claimed in claim 3, wherein the first light guiding portion further comprises: a first phase delay film, disposed on one side of the splitter, such that a part of the reference beam is projected to the first phase delay film and the polarization of the reference beam is converted by the first delay film;a reflecting mirror with a third phase delay film adhered to one side of the reflecting mirror, wherein the reference beam passes through the holographic storage media and is projected to the third phase delay film, and is reflected by the reflecting mirror to pass through the third phase delay film again, such that the polarization of the reference beam is converted, and the reference beam, after projected to the splitter, is projected to the sensing portion, and thus the distance and the included angle between the reflecting mirror and the reference beam are analyzed and then adjusted by moving reflecting mirror; andthe second light guiding portion further comprises:a second phase delay film, disposed on the path of the signal beam, wherein the signal beam passes through the second phase delay film and the polarization of the signal beam is converted to the same as that of the reference beam, then the signal beam is projected to the spatial light modulator;a first polarizing splitter, wherein the signal beam is reflected by the spatial light modulator to the first polarizing splitter, the signal beam is then reflected by the first polarizing splitter to be projected to the lenses and the reflecting mirror sets, and then is projected to the holographic storage media in the second incidence direction to interfere with the reference beam, and thus the holographic interferogram is generated in the holographic storage media;wherein when the reference beam passing through the first phase delay film is projected to the holographic interferogram, a reproducing beam is generated and travels back along the path of the signal beam, and passes through the first polarizing splitter through the lenses and the reflecting mirror sets; andthe image sensor is a two-dimensional image sensor disposed on one side of the first polarizing splitter to receive the reproducing beam passing through the first polarizing splitter.

13. The system for recording and reproducing holographic storage with optical servo as claimed in claim 12, wherein the servo beam guiding portion comprises: a servo beam reflecting mirror set, for reflecting the servo beam to the objective lens to be converged, wherein the servo beam is then projected to a servo track of the holographic storage media and reflected by a wavelength selection film coated on the servo track to the sensing portion through the servo beam reflecting mirror set, such that the servo beam is converted to an electrical signal transmitted to the controlling device, wherein the optical axis of the objective lens is adjusted to be perpendicular to the servo track surface of the holographic storage media by the controlling device, and the reference beam is adjusted to be projected to the holographic storage media in the first incidence direction, and the holographic interferogram is continuously recorded in the holographic storage media along the servo track.

14. The system for recording and reproducing holographic storage with optical servo as claimed in claim 12, wherein the first light guiding portion further comprises a second objective lens, and the second objective lens includes: a first lens; anda second lens, with a focus coinciding with the focus of the first lens, and having a focal length thereof shorter than that of the first lens, such that the diameter of the reference beam generated by the splitter is reduced.

15. The system for recording and reproducing holographic storage with optical servo as claimed in claim 3, wherein the first light guiding portion comprises: a reflecting mirror with a third phase delay film adhered to one side of the reflecting mirror, wherein the reference beam passes through the holographic storage media and is projected to the third phase delay film, and is reflected by the reflecting mirror to the third phase delay film again, such that the polarization of the reference beam is converted, and the reference beam, after being projected to the splitter, is projected to the sensing portion, and thus the distance and the included angle between the reference beam and the holographic storage media are analyzed and adjusted; andthe second light guiding portion further comprises:a first polarizing splitter, wherein when the reference beam is projected to the holographic interferogram, a reproducing beam is generated and projected to the second phase delay film through the lenses and the reflecting mirror sets, and the polarization of the reproducing beam is converted, such that the reproducing beam is reflected when the reproducing beam is projected to the first polarizing splitter; andthe image sensor is a two-dimensional image sensor disposed on one side of the first polarizing splitter to receive the reproducing beam reflected by the first polarizing splitter.

16. The system for recording and reproducing holographic storage with optical servo as claimed in claim 15, wherein the servo beam guiding portion comprises: a servo beam reflecting mirror set, for reflecting the servo beam to the objective lens to be converged, wherein the servo beam is then projected to a servo track of the holographic storage media and reflected by the wavelength selection film coated on the servo track, and the servo beam is projected to the sensing portion through the servo beam reflecting mirror set, such that the servo beam is converted to an electrical signal transmitted to the controlling device, and thus the optical axis of the objective lens is adjusted to be perpendicular to the servo track surface of the holographic storage media by the controlling device, and the reference beam is adjusted to be projected to the holographic storage media in the first incidence direction, and the holographic interferogram is continuously recorded in the holographic storage media along the servo track.

17. The system for recording and reproducing holographic storage with optical servo as claimed in claim 15, wherein the first light guiding portion further comprises a second objective lens, and the second objective lens includes: a first lens; anda second lens, with a focus coinciding with that of the first lens, and a focal length of the second lens shorter than that of the first lens, such that the diameter of the reference beam generated by the splitter is reduced.

18. The system for recording and reproducing holographic storage with optical servo as claimed in claim 3, wherein the first light guiding portion further comprises: a first phase delay film, disposed on one side of the splitter, wherein a part of the reference beam is projected to the first phase delay film and the polarization of the reference beam is changed; a reflecting mirror, for making the reference beam pass through the holographic storage media, and reflect and divert it to return along the original path to be projected to the splitter and then to be diverted to the sensing portion, such that the distance and the angle of tilt between the reflecting mirror and the reference beam are analyzed and adjusted; and

19. The system for recording and reproducing holographic storage with optical servo as claimed in claim 18, wherein the servo beam guiding portion comprises: a servo beam reflecting mirror set, for diverting the servo beam so as to make the servo beam to be a convergent light beam projected to the holographic storage media via the objective lens, wherein the servo beam is then projected to a servo track of the holographic storage media and reflected by the wavelength selection film coated on the servo track, and the servo beam is then projected to the sensing portion through the servo beam reflecting mirror set, such that the servo beam is converted to an electrical signal transmitted to the controlling device, and thus the optical axis of the objective lens is adjusted to be perpendicular to the servo track surface of the holographic storage media by the controlling device, and the reference beam is adjusted to be projected to the holographic storage media in the first incidence direction, and the holographic interferogram is continuously recorded in the holographic storage media along the servo track.

20. The system for recording and reproducing holographic storage with optical servo as claimed in claim 18, wherein the first light guiding portion further comprises a second objective lens, the second objective lens includes: a first lens; anda second lens, with a focus coinciding with that of the first lens, and a focal length shorter than that of the first lens, such that the diameter of the reference beam generated by the splitter is reduced.

21. The system for recording and reproducing holographic storage with optical servo as claimed in claim 2, wherein the first light guiding portion comprises: a third splitter, for splitting the light generated by the light source into the signal beam and the reference beam with the directions of polarization perpendicular to each other, wherein the reference beam is projected to the holographic storage media in the first incidence direction; andthe second light guiding portion comprises:a third phase delay film, disposed on the path of the signal beam, wherein the polarization of the signal beam is converted to be the same as that of the reference beam, and the signal beam is projected to the spatial light modulator;one or more lenses and one or more reflecting mirror sets, for changing the direction of the signal beam after the signal beam is projected to the spatial light modulator, such that the signal beam is projected to the holographic storage media in the second incidence direction and interferes with the reference beam

22. The system for recording and reproducing holographic storage with optical servo as claimed in claim 21, wherein the first light guiding portion further comprises: a first phase delay film, disposed on one side of the third polarizing splitter, such that the polarization of the reference beam projected to the first phase delay film is converted; andthe second light guiding portion further comprises:a second phase delay film, located on the path of the signal beam, wherein the signal beam is projected to the second phase delay film again after being projected to the spatial light modulator, such that the polarization of the signal beam is converted to be the same as that of the reference beam, and thus the holographic interferogram is generated when the reference beam and the signal beam interfere with each other in the holographic storage media;a first polarizing splitter, located on the path of the signal beam, wherein when a part of the reference beam is projected to the holographic interferogram, a reproducing beam is generated and projected to the second phase delay film through the lenses and the reflecting mirror, and the polarization of the part of the reference beam is converted, such that the reproducing beam is reflected when the reproducing beam is projected to the first polarizing splitter; andthe image sensor is a two-dimensional image sensor disposed on one side of the first polarizing splitter to receive the reproducing beam reflected by the first polarizing splitter.

23. The system for recording and reproducing holographic storage with optical servo as claimed in claim 22, wherein the servo beam guiding portion comprises: a reflecting mirror with a fourth phase delay film adhered to one side of the reflecting mirror, wherein the reference beam passes through the holographic storage media and is projected to the fourth phase delay film, and is then reflected by the reflecting mirror to pass through the fourth phase delay film again, such that the polarization of the reference beam is converted, and the reference beam is projected to the sensing portion after being projected to the splitter, and thus the distance and the included angle between the reference beam and the reflecting mirror are analyzed and then adjusted by moving the reflecting mirror; anda servo beam reflecting mirror set, for reflecting the servo beam to the objective lens to be converged and then projected to the holographic storage media, wherein the servo beam is projected to a servo track of the holographic storage media and reflected by a wavelength selection film coated on the servo track, and the servo beam is projected to the sensing portion through the servo beam reflecting mirror set, such that the servo beam is converted to an electrical signal, which is transmitted to the controlling device, thus the optical axis of the objective lens is adjusted to be perpendicular to the servo track surface of the holographic storage media by the controlling device, and the reference beam is adjusted to be projected to the holographic storage media in the first incidence direction, and the holographic interferogram is continuously recorded in the holographic storage media along the servo track.

24. The system for recording and reproducing holographic storage with optical servo as claimed in claim 22, wherein the first light guiding portion further comprises a second objective lens, and the second objective lens includes: a first lens; anda second lens with a focus coinciding with the focus of the first lens, and a focal length of the second lens shorter than that of the first lens, such that the diameter of the reference beam generated by the splitter is reduced.

25. The system for recording and reproducing holographic storage with optical servo as claimed in claim 22, wherein the first light guiding portion further comprises an objective lens for converging the reference beam to be projected to the holographic storage media.

26. The system for recording and reproducing holographic storage with optical servo as claimed in claim 25, wherein the first light guiding portion further comprises a second objective lens, and the second objective lens includes: a first lens with a focus coinciding with that of the objective lens, such that the diameter of the reference beam generated by the splitter is reduced and the reference beam is a parallel light.

27. A system for recording and reproducing holographic storage with optical servo for adopting a holographic storage media, which comprising: a light source for generating a signal beam and a reference beam, wherein the reference beam is projected to the holographic storage media in a first incidence direction;an objective lens set, disposed on the path of the signal beam, such that the signal beam is projected to the holographic storage media through the objective lens;a spatial light modulator, disposed on the path of the signal beam, such that the signal beam is projected to the holographic storage media in a second incidence direction after being projected to the spatial light modulator, and interferes with the reference beam to generate a holographic interferogram in the holographic storage media;wherein when the reference beam is projected to the holographic interferogram in the first incidence direction again, a reproducing beam is generated, and the reproducing beam passes through the holographic storage media and is projected to an image sensor along the path of the signal beam;a servo light source, generating a servo beam; anda servo beam guiding portion, for guiding the servo beam to be projected to a servo track of the holographic storage media, wherein the servo track reflects the servo beam to be received by a sensing portion, such that the holographic interferogram is continuously recorded in the holographic storage media in the servo track, and the servo track is formed in the holographic storage media in layers, such that the holographic interferogram is generated in the holographic storage media in layers along the layered servo track.

28. The system for recording and reproducing holographic storage with optical servo as claimed in claim 27, further comprising a first light guiding portion and a second light guiding portion, wherein the first light guiding portion is disposed in front of the light source for splitting the light generated by the light source into the signal beam and the reference beam, and the first light guiding portion guides the signal beam to be projected to the spatial light modulator and then to the holographic storage media in the first incidence direction; and the second light guiding portion guides the reference beam be projected to the holographic storage media in the second incidence direction.

29. The system for recording and reproducing holographic storage with optical servo as claimed in claim 28, wherein the first light guiding portion comprises: a splitter, for splitting the light projected to the splitter into the signal beam and the reference beam, wherein the signal beam is projected to the holographic storage media in the first incidence direction; andthe second light guiding portion comprises:one or more lenses and one or more reflecting mirror sets, for changing the direction of the reference beam, such that the reference beam is projected to the holographic storage media in the second incidence direction.

30. The system for recording and reproducing holographic storage with optical servo as claimed in claim 29, wherein the signal beam passes through the spatial light modulator and is projected to the objective lens set.

31. The system for recording and reproducing holographic storage with optical servo as claimed in claim 29, wherein the signal beam is projected to the spatial light modulator, and is then projected to the objective lens set.

32. The system for recording and reproducing holographic storage with optical servo as claimed in claim 31, wherein the second light guiding portion further comprises a first reflecting mirror for reflecting the reference beam to the lenses and the reflecting mirror sets.

33. The system for recording and reproducing holographic storage with optical servo as claimed in claim 28, wherein the first light guiding portion comprises: a polarizing splitter, for splitting the light projected into the signal beam and the reference beam, wherein the signal beam is projected to the spatial light modulator and the polarization of the signal is then converted, and after reflected by the spatial light modulator, the signal beam is then reflected by the polarizing splitter to the second reflecting mirror, and is reflected by the second reflecting mirror to the holographic storage media in the first incidence direction; andthe second light guiding portion comprises:one or more lenses and one or more reflecting mirror sets, for changing the direction of the reference beam, such that the reference beam is projected to the holographic storage media in the second incidence direction.

34. The system for recording and reproducing holographic storage with optical servo as claimed in claim 33, wherein the spatial light modulator is a reflective spatial light modulator.

35. The system for recording and reproducing holographic storage with optical servo as claimed in claim 28, wherein the first light guiding portion comprises: a polarizing film, disposed in front of the light source, such that the light generated by the light source is polarized into a linear polarization light after passing through the polarizing film;a splitter, splitting the linear polarization light projected to the splitter into the signal beam and the reference beam, wherein the signal beam is projected to the holographic storage media in the first incidence direction; andthe second light guiding portion comprises:a first phase delay film, disposed on one side of the splitter, such that a part of the reference beam is projected to the first phase delay film, and the polarization of the part of the reference beam is converted;one or more lenses and one or more reflecting mirror sets, for changing the direction of the reference beam and converging the reference beam, such that the reference beam is projected to the holographic storage media in the second incidence direction; anda reference beam reflecting mirror, disposed at the focus of the reference beam, such that the reference beam travels back along the original path and passes through the splitter to be projected to the sensing portion.

36. The system for recording and reproducing holographic storage with optical servo as claimed in claim 35, wherein the signal beam passes through the spatial light modulator and is projected to the objective lens set.

37. The system for recording and reproducing holographic storage with optical servo as claimed in claim 28, wherein the objective lens set comprises: an objective lens, for converging the servo beam and projecting the servo beam to the servo track of the holographic storage media; anda second objective lens with a focus coinciding with that of the objective lens, and the diameter of the signal beam is a reduced and projected to the holographic storage media.

38. The system for recording and reproducing holographic storage with optical servo as claimed in claim 27, wherein the servo beam guiding portion is a servo beam reflecting mirror set for reflecting the servo beam to the objective lens, then servo beam is converged by the objective lens and then is projected to the holographic storage media, wherein the servo beam is projected to a servo track of the holographic storage media, and is reflected by a wavelength selection film coated on the servo track, and the reflected servo beam is projected to the sensing portion via the servo beam reflecting mirror set, such that the servo beam is converted to an electrical signal transmitted to the controlling device, and the holographic interferogram is continuously recorded in the holographic storage media along the servo track by the controlling device.

39. A system for recording and reproducing holographic storage with optical servo for adopting a holographic storage media, which comprising: a light source for generating a signal beam and a reference beam, wherein the reference beam is projected to the holographic storage media in a second incidence direction;an objective lens set, disposed on the path of the signal beam, such that the signal beam is projected to the holographic storage media;a spatial light modulator, disposed on the path of the signal beam, such that after being projected to the spatial light modulator, the signal beam is projected to the holographic storage media in a first incidence direction, and interferes with the reference beam to generate a holographic interferogram in the holographic storage media;wherein when the reference beam is projected to the holographic interferogram in the second incidence direction again, a reproducing beam is generated and reflected by the holographic storage media and is projected to an image sensor along the path of the signal beam;a servo light source for generating a servo beam; anda servo beam guiding portion for guiding the servo beam to be projected to servo tracks of the holographic storage media, and is reflected by the servo tracks and received by a sensing portion, such that the holographic interferogram is continuously recorded in the holographic storage media along the servo track, and the servo tracks are formed in the holographic storage media in layers, and thus the holographic interferogram is generated in the holographic storage media in layers.

40. The system for recording and reproducing holographic storage with optical servo as claimed in claim 39, further comprising: a first light guiding portion disposed in front of the light source, such that the light generated by the light source is split into the signal beam and the reference beam after the light passing through the first light portion, and the signal beam is projected to the spatial light modulator, and the is projected to the holographic storage media in the first incidence direction; anda second light guiding portion for projecting the reference beam to the holographic storage media in the second incidence direction.

41. The system for recording and reproducing holographic storage with optical servo as claimed in claim 40, wherein the first light guiding portion comprises: a polarizing film, disposed in front of the light source, such that the light emitted from the light source generates a linear polarized light after passing through the polarizing film; anda splitter, making the linear polarized light projected to the splitter and split into the signal beam and the reference beam, wherein the signal beam is projected to the holographic storage media along the first incidence direction; andthe second light guiding portion comprises:one or more lenses and one or more reflecting mirror sets, for changing the propagation direction of the reference beam, such that the reference beam is projected to the holographic storage media along the second incidence direction.

42. The system for recording and reproducing holographic storage with optical servo as claimed in claim 41, wherein the first light guiding portion further comprises: a first phase delay film, disposed on the path of the signal beam, such that after being projected to the spatial light modulator, the signal beam is projected to the first phase delay film to have the polarization state changed, and then is projected to the holographic storage media; andthe second light guiding portion further comprises:a second phase delay film, disposed on the path of the reference beam, such that the reference beam has the polarization state changed to be the same as that of the signal beam, and the reference beam is projected to the holographic storage media, and interferes with the signal beam to generate the holographic interferogram.

43. The system for recording and reproducing holographic storage with optical servo as claimed in claim 42, wherein the servo beam guiding portion comprises: a fourth polarizing splitter, disposed between the splitter and the first phase delay film, such that the reference beam is projected to the holographic interferogram to generate the reproducing beam, and the reproducing beam is projected to a third phase delay film of the holographic storage media to have the polarization state changed, and the reproducing beam is reflected and travels back along the original path to be projected to the fourth polarizing splitter, where the reproducing beam is reflected and diverted to be projected to the image sensor; anda servo beam reflecting mirror set, for reflecting the servo beam to the objective lens, and then the servo beam is converged by the objective lens, and projected to the holographic storage media, wherein the servo beam passes through a wavelength selection film of the holographic storage media, and is projected to a servo track of the holographic storage media, and is reflected by the servo track, and the servo beam reflected by the servo track is projected to the sensing portion through the servo beam reflecting mirror set, such that the servo beam is converted to an electrical signal transmitted to the controlling device, and the holographic interferogram is continuously recorded in the holographic storage media along the servo track.

44. The system for recording and reproducing holographic storage with optical servo as claimed in claim 42, wherein the servo beam guiding portion comprises: a fourth polarizing splitter, disposed between the splitter and the first phase delay film, such that the reference beam is projected to the holographic interferogram to generate the reproducing beam, and the reproducing beam is projected to a third phase delay film of the holographic storage media, the polarization of the reproducing beam is converted, and then the reproducing beam is reflected and travels back along the original path to be projected to the fourth polarizing splitter, where the reproducing beam is reflected to the image sensor;a dichroic prism, for splitting a light into lights with different wavelengths, such that the servo beam is reflected by the dichroic prism to be projected to the servo track of the holographic storage media; anda second splitter, disposed on one side of the dichroic prism, such that the servo beam is reflected by the servo track and is projected to the dichroic prism, and is reflected by the dichroic prism to be projected to the second splitter, and is reflected by the second splitter to the sensing portion, such that the servo beam is converted to an electrical signal transmitted to the controlling device, and the holographic interferogram is continuously recorded in the holographic storage media along the servo track by the controlling device.

45. A method for recording and reproducing holographic storage with optical servo, comprising: generating a servo beam;guiding the servo beam to be projected to a servo track of a holographic storage media;generating a reference beam projected to the holographic storage media in a second incidence direction; andgenerating a signal beam which is modulated and parallelized to be projected to the holographic storage media in a first incidence direction, wherein the signal beam and the reference beam interfere with each other to generate a holographic interferogram, such that the holographic interferogram is continuously recorded in the holographic storage media along a servo track of the holographic storage media.

46. The method for recording and reproducing holographic storage with optical servo as claimed in claim 45, further comprising a step after the step of modulating and parallelizing the signal beam, which is providing the servo beam focus on the servo tracks in different layers to generate the holographic interferogram in different layers of the holographic storage media.

47. The method for recording and reproducing holographic storage with optical servo as claimed in claim 45, wherein the step of guiding the servo beam to be projected to a servo track of a holographic storage media comprises: projecting the servo beam the servo track of the holographic storage media;receiving the servo beam;Analyzing the received servo beam to adjust the focus of the servo beam to fall on the holographic storage media and to move according to the servo track of the holographic storage media continuously; anddecoding the servo beam reflected and modulated by the servo track to obtain the data address and the data on the servo tracks.

48. The method for recording and reproducing holographic storage with optical servo as claimed in claim 45, further comprising a step after the step of generating a reference beam, which is receiving and analyzing the reference beam reflected by a reflecting mirror to adjust the distance and the included angle between the system and the reflecting mirror for keeping the reference beam in the second incidence direction.

49. The method for recording and reproducing holographic storage with optical servo as claimed in claim 48, wherein the step of reflecting and receiving the reference beam comprises: focusing the reference beam;projecting the reference beam to be reflected by a reflecting mirror; andreceiving the reference beam.

50. A holographic storage media, adopted for a reference beam and a signal beam interfering therein to generate a holographic interferogram, and recording the holographic interferogram, the holographic storage media comprises: a first substrate;a second substrate;a recording layer, for recording the holographic interferogram, and disposed between the first substrate and the second substrate; andat least one servo track, disposed on one side of the holographic storage media, such that the holographic storage media is continuously recorded in the recording layer along the servo layer.

51. The holographic storage media as claimed in claim 50, wherein the servo track include a plurality of bumps.

52. The holographic storage media as claimed in claim 50, wherein the servo track includes a plurality of pits.

53. The holographic storage media as claimed in claim 50, wherein the holographic storage media comprises a plurality of servo tracks formed in layers.

54. The holographic storage media as claimed in claim 50, further comprising a wavelength selection film disposed in front of the servo track, such that when projected to the wavelength selection layer, the signal beam and the reference beam are reflected by the wavelength selection layer.