Patent Application
20240067876
The present invention relates to alkali metal borophosphates compounds with a chemical formula of A3B11P2O23 (A=K, Rb, Cs, NH4), alkali metal borophosphate nonlinear optical crystals, a preparation method of the crystals and a nonlinear optical apparatus manufactured from the crystals.
Deep-ultraviolet (DUV) coherent lights with wavelengths between 200 and 150 nm are of increasing importance owing to their potential applications in semiconductor photolithography, laser micromachining, modern scientific instruments. For solid-state lasers, the best way to obtain the DUV coherent lights is through the cascaded frequency conversion technology of nonlinear optical (NLO) crystals. However, for an applicable DUV NLO crystal, it must satisfy the following harsh structural and properties' requirements, including i) the non-centrosymmetric (NCS) structures; ii) large second-order NLO coefficients (dij), at least comparable to the d36 of KDP; iii) high transparency in the DUV region with the UV cut-off wavelength as short as possible; iv) a moderate birefringence (Δn=0.05-0.10) to satisfy the phase-matching condition of second-harmonic generation (SHG) in the UV or DUV region; and v) ease of growth, non-toxic, chemical stability, and good mechanical properties. However, since some of the above properties are conflicted, e.g., the materials with large band gaps often exhibit small SHG responses and birefringence, designing and synthesizing a DUV NLO crystal is still a great challenge. Borophosphates with asymmetric [BO4] and [PO4] tetrahedra as basic building blocks usually have large band gaps, and are widely regarded as candidates for exploring UV or DUV optical crystals. Notably, BPO4 has a strong second-harmonic response (2×KDP), and its UV transmittance range extends to about 130 nm. However, its small birefringence of 0.005@1064 nm makes conventional phase matching impossible, and the crystal cannot be used as a UV NLO crystal. However, π-conjugated [BO3] groups with excellent optical anisotropy are beneficial to improve the birefringence of the material. Therefore, designing and synthesizing borophosphates with [BO3], [BO4] and [PO4] groups are an effective way to design DUV NLO materials.
The first objective of the present invention is to provide alkali metal borophosphates compounds with a chemical formula of A3B11P2O23 (A=K, Rb, Cs, NH4). The series of single crystals belong to rhombohedral crystal system, and have a space group of R3, crystal cell parameters of a=b=10.016(5)-12.591(5) Å, c=12.105(6)-14.905(6) Å, Z=3. The polycrystalline powder was prepared through a solid-state reaction method or a hydrothermal method.
Another objective of the present invention is to provide alkali metal borophosphate nonlinear optical crystals and a preparation method thereof. The crystals have a chemical formula of A3B11P2O23 (A=K, Rb, Cs, NH4), and belong to rhombohedral crystal system, as well as have a space group of R3, crystal cell parameters of a=b=10.016(5)-12.591(5) Å, c=12.105(6)-14.905(6) Å, Z=3. The preparation methods are high-temperature solid-state reaction method, hydrothermal method, and solution method.
Another objective of the present invention is to provide the use of alkali metal borophosphates nonlinear optical apparatus in nonlinear optical devices such as second harmonic generators, up and down frequency converters, optical parametric oscillations, laser frequency conversion devices, and laser communications.
The present invention adopts the following technical solution:
The alkali metal borophosphates provided by the present invention have a chemical formula of A3B11P2O23 (A=K, Rb, Cs, NH4). The series of single crystals belong to rhombohedral crystal system, and have a space group of R3, crystal cell parameters of a=b=10.016(5)-12.591(5) Å, c=12.105(6)-14.905(6) Å, Z=3. The preparation processes adopt a high-temperature solid-state reaction method, a hydrothermal method or a solution method based on the following steps:
The high-temperature solid-state reaction method is used to prepare nonlinear optical crystals A3B11P2O23, wherein A=K, Rb, Cs, NH4, comprising the following steps: A mixture of a A-containing compound (A=K, Rb, Cs, NH4), a boron-containing compound, a phosphorus-containing compound was thoroughly ground, and the mixture was preheated to 350-800° C., held at this temperature for a period of time, with several intermediate grindings to get the A3B11P2O23 (A=K, Rb, Cs, NH4) single phase, wherein element A=K, Rb, Cs, NH4 in the A-containing compound, elemental boron in the boron-containing compound, and elemental phosphorus in the phosphorus-containing compound are in a molar ratio of 2.5-3.5:10.5-11.5:1.5-2.5.
The hydrothermal method is used to prepare nonlinear optical crystals A3B11P2O23, wherein A=K, Rb, Cs, NH4, comprising the following steps: a. A mixture of a A-containing compound (A=K, Rb, Cs, NH4), a boron-containing compound, a phosphorus-containing compound was combined with deionized water (0.1-50 mL) or mineralizer 0.1-50 g, in which element A=K, Rb, Cs, NH4 in the A-containing compound, elemental boron in the boron-containing compound, and elemental phosphorus in the phosphorus-containing compound are in a molar ratio of 1-4:10-12:1-3;
The solution method is used to prepare A3B11P2O23, wherein A=K, Rb, Cs, NH4 nonlinear optical crystals, comprising the following steps: A mixture of a A-containing compound (A=K, Rb, Cs, NH4), a boron-containing compound, a phosphorus-containing compound, and deionized water (0.1-400 mL) was placed in a beaker and stirred until dissolved completely. Then put the beaker on the heating table and heat it to 25-400° C. After a period of time, the series of alkali metal borophosphates nonlinear optical crystals are obtained. In order to further grow them, the seed crystals of the series of nonlinear optical crystals were suspended in solution with fine platinum wires. In order to reduce the evaporation of water, the beaker is covered with a layer of polyethylene plate and pierced with dozens of millimeter sized holes. After a period of time, take out the centimeter size alkali metal borophosphates nonlinear optical crystals from the solution.
The alkali metal borophosphates compounds provided by the present invention have a chemical formula of A3B11P2O23 (A=K, Rb, Cs, NH4), which are namely K3B11P2O23, Rb3B11P2O23, Cs3B11P2O23, (NH4)3B11P2O23, and the formula weights are 666.15, 805.26, 947.57, and 602.97, respectively. The series of alkali metal borophosphates compounds can be prepared by a high-temperature solid-state reaction method, a hydrothermal method, or a solution method based on the following chemical reaction formulas:
The alkali metal borophosphates nonlinear optical crystals provided by the present invention are characterized in that the crystals have a chemical formula of A3B11P2O23 (A=K, Rb, Cs, NH4), and belong to rhombohedral crystal system, as well as have a space group of R3, crystal cell parameters of a=b=10.016(5)-12.591(5) Å, c=12.105(6)-14.905(6) Å, Z=3.
The alkali metal borophosphates nonlinear optical crystals provided by the present invention adopt a high-temperature solid-state reaction method, a hydrothermal method or a solution method based on the following specific operation steps:
The high-temperature solid-state reaction method is used to prepare A3B11P2O23, wherein A=K, Rb, Cs, NH4 nonlinear optical crystals, comprising the following steps:
Or directly heat the mixture of a A-containing compound (A=K, Rb, Cs, NH4), a boron-containing compound, and a phosphorus-containing compound or the mixture of a A-containing compound (A=K, Rb, Cs, NH4), a boron-containing compound, a phosphorus-containing compound and the fluxing agents to 350-800° C., and held at this temperature for a period of time to obtain a mixed melt. And then cooled to a temperature of 300-750° C., in which the molar ratios of a A-containing compound (A=K, Rb, Cs, NH4), a boron-containing compound and a phosphorus-containing compound to the fluxing agents are 2.5-3.5:10.5-11.5:1.5-2.5:0-20;
The fluxing agents mainly include at least one or more of alkali metal salts, i.e., alkali metal carbonates, alkali metal nitrates, alkali metal sulfates, alkali metal oxalates, alkali metal borates, alkali metal phosphates, alkali metal halides, alkali metal fluoroborates, alkali metal metaborates, and alkali metal oxides, alkali metal hydroxides, and monohydrogen phosphates, dihydrogen phosphates, boron oxide, boric acid, phosphoric acid, lead oxide, lead fluoride, molybdenum oxide, bismuth oxide.
The compound alkali metal borophosphates single-phase polycrystalline powder are prepared by a solid-state method, including the following steps: mixing a A-containing compound (A=K, Rb, Cs, NH4), a boron-containing compound and a phosphorus-containing compound by a solid-state method to obtain the compound alkali metal borophosphates. The element A=K, Rb, Cs, NH4 in the A-containing compound, the element boron in the boron-containing compound, and the element phosphorus in the phosphorus-containing compound are in a molar ratio of 2.5-3.5:10.5-11.5:1.5-2.5, and the raw materials of the A-containing compound (A=K, Rb, Cs, NH4), the boron-containing compound and the phosphorus-containing compound are mixed uniformly. After grinding, the mixture was preheated to remove moisture and gas, and then cool to room temperature.
Further, the mixture was gradually heated to 350-800° C., held at this temperature for a period of time. The alkali metal borophosphates compounds single-phase polycrystalline powder are obtained.
The hydrothermal method is used to prepare A3B11P2O23, wherein A=K, Rb, Cs, NH4 nonlinear optical crystals, comprising the following steps:
The solution method is used to prepare A3B11P2O23, wherein A=K, Rb, Cs, NH4 nonlinear optical crystals, comprising the following steps:
A mixture of a A-containing compound (A=K, Rb, Cs, NH4), a boron-containing compound, a phosphorus-containing compound, and deionized water (0.1-400 mL) was placed in a beaker and stirred until dissolved completely. Then put the beaker on the heating table and heat it to 25-400° C. After a period of time, a series of alkali metal borophosphates nonlinear optical crystals are obtained. In order to further grow them, the seed crystals of the series of crystals were suspended in solution with fine platinum wires. In order to reduce the evaporation of water, the beaker is covered with a layer of polyethylene plate and pierced with dozens of millimeter sized holes. After a period of time, take out a centimeter size alkali metal borophosphates nonlinear optical crystals from the solution.
The alkali metal borophosphates crystals have the advantages of high purity, easy crystal growth, transparent and no package, fast growth speed, low cost and easy to obtain large-size crystals; the obtained crystals have the advantages of wide light transmission band, high hardness, good mechanical properties, not easy to break and deliquescence, and easy to process and preserve. The nonlinear optical device made of the series of alkali metal borophosphates nonlinear optical crystals obtained by the method of the invention in manufacturing a nonlinear optical device comprising means for generating at least one output radiation with a frequency different from that of the incident electromagnetic radiation after passing at least one beam of incident electromagnetic radiation through at least one nonlinear optical crystal, wherein the nonlinear optical crystal is A3B11P2O23, in which A=K, Rb, Cs, NH4, and the molecular formula are K3B11P2O23, Rb3B11P2O23, Cs3B11P2O23, and (NH4)3B11P2O23, respectively.
The present invention is described above through specific embodiments, but the invention is not limited to these embodiments.
A3B11P2O23 (A=K, Rb, Cs, NH4) polycrystalline powder was prepared according to a reaction formula: 3A2CO3 (A=K, Rb, Cs, NH4)+22H3BO3+4NH4H2PO4→2A3B11P2O23 (A=K, Rb, Cs, NH4)+39H2O↑+3CO2↑+4NH3↑ as follows:
Reagents were weighed according to stoichiometric proportion and were put in a mortar, and then mixed and ground carefully. The mixture was put in a lidless corundum crucible of size of (100 mm×100 mm. The said crucible was put into a muffle furnace, heated to 350° C. slowly and held at this temperature for 24 hours. After being cooled down, the loose and porous sample was taken out of the crucible and was once again mixed thoroughly, ground and put back to the crucible and compacted. The mixture was heated at 550° C. for 24 h and cooled to room temperature. The sample was then taken out and ground thoroughly, and the mixture was put back to the crucible and heated at 550° C. for 48 h. The product was analyzed by the powder X-ray diffraction of the product, where the X-ray diffraction pattern was consistent with a theoretical X-ray diffraction pattern of A3B11P2O23 (A=K, Rb, Cs, NH4) analyzed by a single-crystal structure.
Then, the single-phase polycrystalline powder was put into a (80 mm×80 mm lidless platinum crucible which was placed in the center of a vertical, programmable temperature furnace, was heated at 850° C. until the melt became transparent and clear, held at this temperature for 15 h, and then quickly cooled to the initial crystallization temperature (650° C.). Then, a platinum wire was promptly dipped into the solution. The temperature was decreased at a rate of 0.5° C./h, then the platinum wire was pulled out of the solution, and allowed to cool to room temperature at a rate of 10° C./h.
Thus, a few colorless, transparent plate crystals crystallized on the platinum wire. The obtained crystals could be used as seeds. A seed crystal of A3B11P2O23 (A=K, Rb, Cs, NH4) was attached with Pt wire to a Pt rod and then suspended on solution at 600° C. for a quarter. The seed crystal was kept at this temperature in solution for half an hour while rotating at a rate of 10 rpm. The temperature of the furnace was first lowered quickly to 550° C. and then lowered at a rate of 2° C./day. After the growth of crystal ended, the crystal was lifted out of liquid surface. The temperature of the crystal was then lowered to room temperature at a rate of 10° C./h. As a result, transparent A3B11P2O23 (A=K, Rb, Cs, NH4) crystal with a size of 56 mm×40 mm×30 mm was obtained.
A3B11P2O23 (A=K, Rb, Cs, NH4) polycrystalline powder was prepared according to a reaction formula: 3AOH (A=K, Rb, Cs, NH4)+11H3BO3+P2O5→A3B11P2O23 (A=K, Rb, Cs, NH4)+18H2O↑ as follows:
Reagents were weighed according to stoichiometric proportion, preparation of A3B11P2O23 (A=K, Rb, Cs, NH4) crystal by fluxing agent method: AOH (A=K, Rb, Cs, NH4)—P2O5 as the fluxing agent system, the said reagents are used as the solute with the molar ratio of solute:fluxing agent=1:4, the molar ratio of AOH (A=K, Rb, Cs, NH4)/P2O5 was selected at 3/5. Then, mixed the said reagents with fluxing agent and put into a Φ 80 mm×80 mm lidless platinum crucible which was placed in the center of a vertical, programmable temperature furnace, was heated at 800° C., held at this temperature for 60 h, and then quickly cooled to the initial crystallization temperature (750° C.).
The temperature was decreased to room temperature at a rate of 1.5° C./h to obtain the seeds.
A seed crystal of A3B11P2O23 (A=K, Rb, Cs, NH4) was attached with Pt wire to a Pt rod and then suspended on solution at 700° C. for ten minutes. The seed crystal was kept at this temperature in solution for half an hour while rotating at a rate of 10 rpm. The temperature of the furnace was first lowered quickly to 600° C. and then lowered at a rate of 1° C./day. After the growth of crystal ended, the crystal was lifted out of liquid surface. The temperature of the crystal was then lowered to room temperature at a rate of 20° C./h. As a result, transparent A3B11P2O23 (A=K, Rb, Cs, NH4) crystal with a size of 36 mm×22 mm×15 mm was obtained.
A3B11P2O23 (A=K, Rb, Cs, NH4) polycrystalline powder was prepared according to a reaction formula: 3A2CO3 (A=K, Rb, Cs, NH4)+22H3BO3+2P2O5→2A3B11P2O23 (A=K, Rb, Cs, NH4)+33H2O↑+3CO2↑ as follows:
The said polycrystalline A3B11P2O23 (A=K, Rb, Cs, NH4) is used as the solute with the molar ratio of solute:fluxing agent (H3BO3—P2O5)=1:3. Then, mixed homogeneously and put into a Φ 80 mm×80 mm lidless platinum crucible which was placed in the center of a vertical, programmable temperature furnace, was heated at 350° C. until the melt became transparent and clear, held at this temperature for 60 h, and then quickly cooled to the initial crystallization temperature (330° C.).
The temperature was decreased to room temperature at a rate of 3.5° C./h to obtain the seeds.
A seed crystal of A3B11P2O23 (A=K, Rb, Cs, NH4) was attached with Pt wire to a Pt rod and then suspended on solution for 15 minutes. The seed crystal was kept at this temperature in solution for twenty minutes while rotating at a rate of 5 rpm. The temperature of the furnace was first lowered quickly to 315° C. and then lowered at a rate of 3° C./day.
After the growth of crystal ended, the crystal was lifted out of liquid surface. The temperature of the crystal was then lowered to room temperature at a rate of 1° C./h. As a result, transparent A3B11P2O23 (A=K, Rb, Cs, NH4) crystal with a size of 25 mm×24 mm×10 mm was obtained.
A3B11P2O23 (A=K, Rb, Cs, NH4) polycrystalline powder was prepared according to a reaction formula: 3A2O (A=K, Rb, Cs, NH4)+22H3BO3+2P2O5→2A3B11P2O23 (A=K, Rb, Cs, NH4)+33H2O↑ as follows:
A3B11P2O23 (A=K, Rb, Cs, NH4) polycrystalline powder was prepared according to a reaction formula: 3AF (A=K, Rb, Cs, NH4)+11H3BO3+2NH4H2PO4→A3B11P2O23 (A=K, Rb, Cs, NH4)+18 H2O↑+3HF↑+2NH3↑ as follows:
A3B11P2O23 (A=K, Rb, Cs, NH4) polycrystalline powder was prepared according to a reaction formula: 3A2CO3 (A=K, Rb, Cs, NH4)+11B2O3+4NH4H2PO4→2A3B11P2O23 (A=K, Rb, Cs, NH4)+6H2O↑+3CO2↑+4NH3↑ as follows:
Reagents were weighed according to stoichiometric proportion, and then the mixture was placed in a beaker (10 mL), further add 0.1 mL deionized water into the beaker and stirred until dissolved completely. Then put the beaker on the heating table and heat it to 25° C. After 2 days, the series of alkali metal borophosphates nonlinear optical crystals are obtained. In order to further grow them, the seed crystals of the series of crystals were suspended in solution with fine platinum wires. In order to reduce the evaporation of water, the beaker is covered with a layer of polyethylene plate and pierced with dozens of millimeter sized holes. After 3 weeks, take out a centimeter size alkali metal borophosphates nonlinear optical crystals from the solution.
A3B11P2O23 (A=K, Rb, Cs, NH4) polycrystalline powder was prepared according to a reaction formula: 3A2CO3 (A=K, Rb, Cs, NH4)+11B2O3+2P2O5→2A3B11P2O23 (A=K, Rb, Cs, NH4)+3CO2↑ as follows:
Reagents were weighed according to stoichiometric proportion, and then the mixture was placed in a beaker (1000 mL), further add 400 mL deionized water into the beaker and stirred until dissolved completely. Then put the beaker on the heating table and heat it to 400° C. After 7 days, the series of alkali metal borophosphates nonlinear optical crystals are obtained. In order to further grow them, the seed crystals of the series of crystals were suspended in solution with fine platinum wires. In order to reduce the evaporation of water, the beaker is covered with a layer of polyethylene plate and pierced with dozens of millimeter sized holes. After 5 weeks, take out a centimeter size alkali metal borophosphate nonlinear optical crystal from the solution.
A3B11P2O23 (A=K, Rb, Cs, NH4) polycrystalline powder was prepared according to a reaction formula: 3AH2PO4 (A=K, Rb, Cs, NH4)+5.5B2O3→A3B11P2O23 (A=K, Rb, Cs, NH4)+1.5H2O↑+H3PO4 as follows:
Reagents were weighed according to stoichiometric proportion, preparation of A3B11P2O23 (A=K, Rb, Cs, NH4) crystal by fluxing agent method: AOH (A=K, Rb, Cs, NH4)—PbO as the fluxing agent system, the said reagents are used as the solute with the molar ratio of solute:fluxing agent=4:7, the molar ratio of AOH (A=K, Rb, Cs, NH4)/PbO was selected at 1/6. Then, mixed the said reagents with fluxing agent and put into a Φ80 mm×80 mm lidless platinum crucible which was placed in the center of a vertical, programmable temperature furnace, was heated at 350° C., held at this temperature for 60 h, and then quickly cooled to the initial crystallization temperature (330° C.).
The temperature was decreased to room temperature at a rate of 3.5° C./h to obtain the seeds.
A seed crystal of A3B11P2O23 (A=K, Rb, Cs, NH4) was attached with Pt wire to a Pt rod and then suspended on solution at 330° C. for 15 minutes. The seed crystal was kept at this temperature in solution for half an hour while rotating at a rate of 10 rpm. The temperature of the furnace was first lowered quickly to 315° C. and then lowered at a rate of 3° C./day. After the growth of crystal ended, the crystal was lifted out of liquid surface. The temperature of the crystal was then lowered to room temperature at a rate of 1° C./h. As a result, transparent A3B11P2O23 (A=K, Rb, Cs, NH4) crystal with a size of 25 mm×24 mm×10 mm was obtained.
A3B11P2O23 (A=K, Rb, Cs, NH4) polycrystalline powder was prepared according to a reaction formula: 3A2HPO4 (A=K, Rb, Cs)+11B2O3+0.5P2O5→2A3B11P2O23 (A=K, Rb, Cs, NH4)+1.5H2O↑ as follows:
Reagents were weighed according to stoichiometric proportion, preparation of A3B11P2O23 (A=K, Rb, Cs, NH4) crystal by fluxing agent method: A2CO3 (A=K, Rb, Cs, NH4)—H3BO3—NH4H2PO4 as the fluxing agent system, the said reagents are used as the solute with the molar ratio of solute:fluxing agent=5:2, the molar ratio of A2CO3 (A=K, Rb, Cs, NH4 NH4)/H3BO3/NH4H2PO4 was selected at 5/16/16. Then, mixed the said reagents with fluxing agent and put into a (P 80 mm×80 mm lidless platinum crucible which was placed in the center of a vertical, programmable temperature furnace, was heated at 550° C., held at this temperature for 60 h, and then quickly cooled to the initial crystallization temperature (530° C.).
The temperature was decreased to room temperature at a rate of 3.5° C./h to obtain the seeds.
A seed crystal of A3B11P2O23 (A=K, Rb, Cs, NH4) was attached with Pt wire to a Pt rod and then suspended on solution at 530° C. for 15 minutes. The seed crystal was kept at this temperature in solution for half an hour while rotating at a rate of 10 rpm. The temperature of the furnace was first lowered quickly to 515° C. and then lowered at a rate of 3° C./day. After the growth of crystal ended, the crystal was lifted out of liquid surface. The temperature of the crystal was then lowered to room temperature at a rate of 1° C./h. As a result, transparent A3B11P2O23 (A=K, Rb, Cs, NH4) crystal with a size of 25 mm×24 mm×10 mm was obtained.
A3B11P2O23 (A=K, Rb, Cs, NH4) polycrystalline powder was prepared according to a reaction formula: 6AOH (A=K, Rb, Cs, NH4)+11B2O3+2P2O5→2A3B11P2O23 (A=K, Rb, Cs, NH4)+3H2O↑ as follows:
Reagents were weighed according to stoichiometric proportion, preparation of A3B11P2O23 (A=K, Rb, Cs, NH4) crystal by fluxing agent method: ABF4-MoO3 as the fluxing agent system, the said reagents are used as the solute with the molar ratio of solute:fluxing agent=9:3, the molar ratio of ABF4/MoO3 was selected at 4/7. Then, mixed the said reagents with fluxing agent and put into a Φ 80 mm×80 mm lidless platinum crucible which was placed in the center of a vertical, programmable temperature furnace, was heated at 450° C., held at this temperature for 60 h, and then quickly cooled to the initial crystallization temperature (400° C.).
The temperature was decreased to room temperature at a rate of 3.5° C./h to obtain the seeds.
A seed crystal of A3B11P2O23 (A=K, Rb, Cs, NH4) was attached with Pt wire to a Pt rod and then suspended on solution at 405° C. for 15 minutes. The seed crystal was kept at this temperature in solution for half an hour while rotating at a rate of 10 rpm. The temperature of the furnace was first lowered quickly to 400° C. and then lowered at a rate of 3° C./day. After the growth of crystal ended, the crystal was lifted out of liquid surface. The temperature of the crystal was then lowered to room temperature at a rate of 1° C./h. As a result, transparent A3B11P2O23 (A=K, Rb, Cs, NH4) crystal with a size of 25 mm×24 mm×10 mm was obtained.
A3B11P2O23 (A=K, Rb, Cs, NH4) polycrystalline powder was prepared according to a reaction formula: 12AH2PO4 (A=K, Rb, Cs, NH4)+22H3B2O3+2P2O5→4A3B11P2O23 (A=K, Rb, Cs, NH4)+33H2↑+8H3PO4 as follows:
A3B11P2O23 (A=K, Rb, Cs, NH4) polycrystalline powder was prepared according to a reaction formula: 6ACl (A=K, Rb, Cs, NH4)+11B2O3+4NH4H2PO4→2A3B11P2O23 (A=K, Rb, Cs, NH4)+6HCl↑+4NH3↑+3H2O↑ as follows:
A3B11P2O23 (A=K, Rb, Cs, NH4) polycrystalline powder was prepared according to a reaction formula: 6ACl (A=K, Rb, Cs, NH4)+22H3BO3+2P2O5→2A3B11P2O23 (A=K, Rb, Cs, NH4)+6HCl↑+30H2O↑ as follows:
Reagents were weighed according to stoichiometric proportion, and then the mixture was placed in a beaker (10 mL), further add 0.1 mL deionized water into the beaker and stirred until dissolved completely. Then put the beaker on the heating table and heat it to 400° C. After 7 days, the series of alkali metal borophosphates nonlinear optical crystals are obtained. In order to further grow them, the seed crystals of the series of crystals were suspended in solution with fine platinum wires. In order to reduce the evaporation of water, the beaker is covered with a layer of polyethylene plate and pierced with dozens of millimeter sized holes. After 5 weeks, take out a centimeter size alkali metal borophosphate nonlinear optical crystal from the solution.
Any K3B11P2O23, Rb3B11P2O23, Cs3B11P2O23, and (NH4)3B11P2O23 nonlinear optical crystals obtained according to embodiments 1 to 13 were mounted on the position of 3 as shown in
Any K3B11P2O23, Rb3B11P2O23, Cs3B11P2O23, and (NH4)3B11P2O23 nonlinear optical crystals obtained according to embodiments 1 to 13 were mounted on the position of 3 as shown in
Any K3B11P2O23, Rb3B11P2O23, Cs3B11P2O23, and (NH4)3B11P2O23 nonlinear optical crystals obtained according to embodiments 1 to 13 were subjected to directional cutting and polishing processing to form a single crystal device. A 1064 nm Nd: YAG Q-switched laser source was used as a pump source to generate a laser output with a wavelength shorter than 266 nm.
| Number | Date | Country | Kind |
|---|---|---|---|
| 202211033912X | Aug 2022 | CN | national |
