31 results about "Nonlinear optical crystal" patented technology

This invention discloses a samarium-lanthanum co-doped calcium oxyborate yttrium nonlinear optical crystal material, its preparation method, and its applications. The samarium-lanthanum co-doped calcium oxyborate yttrium nonlinear optical crystal material belongs to the monoclinic crystal system, has a space group of Cm, and a chemical formula of Sm. 0.3 La 0.1 :Y 0.6 Ca4O(BO3)3 has a second harmonic response intensity of 0.89 × KDP, and exhibits transmittance exceeding 80% in the 500–1000 nm and 1600–2400 nm wavelength ranges. It also has a strong absorption peak in the 1000–1600 nm wavelength range. Therefore, the samarium-lanthanum co-doped calcium oxyborate yttrium nonlinear optical crystal can be considered as a nonlinear optical crystal material with broad application prospects in the field of optics.

A laser assembly and a method for generating continuous-wave (CW) light at approximately 193 nm (between 180 nm and 200 nm) and at a power of 1W or higher using two CW laser sources: one laser source generating first fundamental light that is twice frequency doubled or otherwise converted into first CW light having a first deep-ultraviolet (DUV) wavelength between 250 nm and 275 nm, the other laser source generating second CW light having an infrared (IR) wavelength between 1300 nm and 1700 nm. A resonant cavity receives the second CW light and generates enhanced CW light at 100 W or higher. A first non-linear optical (NLO) crystal mixes a first enhanced CW light portion and the first CW light to generate sum-frequency generation (SFG) light having a second DUV wavelength. A second NLO crystal mixes a second enhanced CW light portion and the SFG light to generate output CW light at approximately 193 nm.

The application provides a fluorinated guanidinium borate nonlinear optical crystal and a preparation method and application thereof. The chemical formula of the crystal is [C(NH2)3]B6O9F, the molecular weight is 287.95, the crystal belongs to an orthorhombic system, the space group is Pnma, Pna 21, the cell parameter is a=7.8420(11) Å, b=15.1862(19) Å, c=8.5762(9) Å, α =90°, β =90°, γ =90°, the unit cell volume is 1021.3(2) ų, the crystal is grown by a high-temperature solution method or a flux method, the frequency doubling effect of the crystal is 0.4 times of that of KH2PO4 (KDP), the ultraviolet cutoff edge is 190 nm, the birefringence is large, the birefringence is 0.133 @ 1064 nm, and the deep ultraviolet phase matching capability is deep, the shortest matching wavelength is 196 nm, and the crystal can be applied to deep ultraviolet nonlinear optical crystals in a full solid-state laser.

This invention relates to a nonlinear optical crystal of potassium triacetate dihydrate, its preparation method, and its uses. The molecular formula of the crystal is K3C6O8H. 10 It has a molecular weight of 331.62, belongs to the orthorhombic crystal system, and has a space group of [missing information]. P 212121, cell parameters are a =8.7596(5)Å, b =10.0487(6)Å, c =13.9979(6)Å, α =90.00° β =90.00° gamma =90.00° Z =4, V =1232.13(11)Å 3 Centimeter-sized crystals were grown using an evaporation method and an aqueous solution cooling method. Under 1064nm laser irradiation, the powder frequency doubling effect of this crystal was equivalent to that of KH₂PO₄. 4 (KDP). This crystal has an ultraviolet absorption edge shorter than 200 nm and an experimental birefringence of approximately 0.06 at 546 nm. It is simple to prepare, low in cost, exhibits significant nonlinear optical effects, a large birefringence, a wide transmission range, and is easy to grow and process. It can be used as an ultraviolet nonlinear optical crystal and a birefringent crystal.

This invention discloses potassium borosilicate, potassium borosilicate nonlinear optical crystals, their preparation methods, and applications, belonging to the field of nonlinear optical crystal technology. The chemical formula of potassium borosilicate is K4B6Si3O. 17 With a molecular weight of 577.53, it was prepared using solid-state synthesis or vacuum encapsulation; the chemical formula of this crystal is K4B6Si3O. 17 It has a molecular weight of 577.53, belongs to the monoclinic crystal system, and has a space group of C 2. The unit cell parameters are a =11.8628(13)Å, b =6.6285(6)Å, c =11.0097(19)Å, β =117.183(4)°, unit cell volume is 770.10(17) Å. 3 The powder frequency doubling effect of the crystal is about 1.4 times that of KH2PO4 (KDP), and the ultraviolet absorption edge is shorter than 190 nm. The crystal has good chemical stability and can be used as an ultraviolet and deep ultraviolet nonlinear optical crystal in all-solid-state lasers.

This invention relates to a series of alkali metal rare earth chalcogenides and a series of alkali metal rare earth chalcogenide nonlinear optical crystals, their preparation methods, and their applications. The general chemical formula for both the series of halides and the nonlinear optical crystals is A3Ln. 11 Ga 19 Q 45 X3, where A = K, Rb, Cs; Ln = La, Pr, Nd; Q = S, Se; X = Cl, Br, I, all belong to the hexagonal crystal system with space group and cell parameter Z = 1. This series of halides is synthesized using a high-temperature solid-state method, while this series of nonlinear optical crystals is grown using a high-temperature solution method or the Bridgman process. This material can be used to manufacture second harmonic generators, up- and down-frequency converters, optical parametric oscillators, etc.

The invention discloses a lanthanum ion doped oxygen calcium yttrium borate nonlinear optical crystal material and a preparation method thereof, the lanthanum ion doped oxygen calcium yttrium borate nonlinear optical crystal material belongs to a monoclinic system, the space group is Cm, the chemical formula is La0.1: Y0. 9Ca4O (BO3) 3, the frequency multiplication coefficient is 2 * KDP, the ultraviolet cut-off edge is less than 200 nm, and no absorption peak with the intensity greater than or equal to 0.2 cm <-1 > exists in the range of 200-2500 nm. Therefore, the lanthanum ion doped yttrium calcium oxide borate crystal can be used as a nonlinear optical material with a wide application prospect in the field of optical parameter chirped pulse amplification.

The application relates to a compound arsenic-silicon-gallium-strontium and an infrared nonlinear optical crystal of arsenic-silicon-gallium-strontium, a preparation method and application, the compound has a molecular formula of SrGa3Si4As 11 , a molecular weight of 1233.26 g / mol, an asymmetric center, and is crystallized in a hexagonal crystal system P , a 63 space group, a cell parameter of a=b=9.2604(3) A, c=11.6484(5) A, Z=2, and V=865.08(7) A 3 , and is prepared into a crystal by using a high-temperature melt method, a chemical vapor phase transmission method or a flux method. The crystal has strong laser damage resistance, large nonlinear optical effect, wide infrared transmission range, and simultaneously has the advantages of large hardness, good mechanical property, not easy to break and deliquesce, easy to process and store and the like, and can be used for manufacturing infrared nonlinear optical devices.

The present invention relates to a preparation method for a trigonal nonlinear optical crystal frequency converter and an operating method. The frequency converter has a first group of parallel surfaces and a second group of parallel surfaces, wherein the first group of parallel surfaces is parallel to a c-axis and an a-axis of an optical crystal, an angle α is formed between a normal of the second group of parallel surfaces and the c-axis, and an included angle β is formed between the projection of the normal on an a-b plane and the a-axis; and θPM having a relation shown in Formula (1) and Formula (2) is a phase matching angle of the nonlinear optical crystal satisfying an incident fundamental frequency light and an emergent variable frequency light, where θB=arctann, which is a Brewster angle, n is the refractive index of the nonlinear optical crystal corresponding to the incident fundamental frequency light, and the second group of parallel surfaces includes a light transmission input surface and a light transmission output surface of the frequency converter. The present invention provides, on the basis of a thin sheet-like primary crystal, a preparation method for a nonlinear optical crystal frequency converter having a length in a light transmission direction as large as possible and suitable for continuous wave application and an operating method.

This invention relates to a compound strontium borate nitrate and a strontium borate nitrate nonlinear optical crystal, as well as their preparation methods and uses. The chemical formula of the compound is Sr3B9O. 16 (NO3), with a molecular weight of 678.16, was prepared using a vacuum-sealed tube method; the chemical formula of this crystal is Sr3B9O. 16 (NO3), with a molecular weight of 678.16, belongs to the monoclinic crystal system and has a space group of Cc The unit cell parameters are a =11.2574(9)Å, b =6.6400(9)Å, c =18.1027(13)Å, Z=4, V=1348.9(2)Å 3 It is prepared using a high-temperature melt method or hydrothermal method under vacuum sealing conditions. Its nonlinear optical effect is approximately three times that of KDP, and its birefringence is 0.088@546 nm. This method has advantages such as simple preparation, short growth cycle, low toxicity of starting materials, and minimal harm to humans. Sr3B9O obtained by the method described in this invention... 16 (NO3) Nonlinear optical crystals have stable physicochemical properties, large nonlinear effects, and can be applied to phase-matching wavelengths in the ultraviolet band. They can be widely used in nonlinear optical devices such as frequency doubling converters and optical parametric oscillators.

This application discloses a fluorinated zirconium phosphate compound, its nonlinear optical crystal, its preparation method, and its applications. The chemical formula of the fluorinated zirconium phosphate compound is Zr(H2PO4)(HPO4)F·nH2O, where 0≤n≤3, and n is an integer. Its nonlinear optical crystal consists of a two-dimensional infinite layered structure formed by [ZrO5F] coordination polyhedra and [HPO4] and [H2PO4] tetrahedra connected by shared oxygen atoms, with interlayer crystal water molecules forming a hydrogen bond network. The nonlinear optical crystal is a non-centrosymmetric crystal; it belongs to the monoclinic crystal system; and its space group is [missing information - likely a specific space group or group]. I 2; The unit cell parameters of a nonlinear optical crystal are a =10.1200(5)Å, b =6.5653(3)Å, c =15.6899(8), β =92.340(5), unit cell volume V =1041.58(9)Å 3 This nonlinear optical crystal possesses deep ultraviolet transparency, a considerable frequency doubling response, and high birefringence, thus meeting the application requirements of nonlinear optical devices. Furthermore, the preparation method has the advantages of simple operation, low cost, low pollution, and low toxicity of the raw materials used.

This invention relates to a series of malonate borate nonlinear optical crystals, their preparation methods, and applications. The general molecular formula of this series of compounds is AM[C3H2O4]B(OH)3(H2O). x Where A = K, Rb, Cs; M = K, Rb, Cs, x = 0, 1, molecular weight is 242.08–436.72, prepared by room temperature solution method, orthorhombic crystal system, space group P 212121 (No. 19), with cell parameters a = 6.6168(11) - 7.256(3) Å, b = 9.574(5) - 10.271(3) Å, c = 13.0172(12) - 13.984(5) Å. α =90, β =90, gamma =90, Z =4, V=851.3(4)-1042.2(7)Å 3 The series of malonate borate nonlinear optical crystals obtained by this method have advantages such as a wide transmission band, stable physicochemical properties, moderate mechanical hardness, resistance to breakage, and ease of cutting, polishing, and storage. They can withstand 1064nm infrared light incident on AM[C3H2O4]B(OH)3(H2O). x The crystal can produce green frequency-doubled light with a wavelength of 532nm, and the output intensity is about 0.5-1.2 times that of KDP under the same conditions.

This invention relates to an aminomethylphosphonic acid aminoguanidine nonlinear optical crystal, its preparation method, and its uses. The crystal has the molecular formula (CN4OH7)(CH2NH3PO3), a molecular weight of 203.15, belongs to the orthorhombic crystal system, and has a space group of [missing information]. P 212121, cell parameters are a =6.276(2)Å, b =10.239(4)Å, c =13.868(4)Å, α =90.00° β =90.00° c =90.00° Z =4, V =891.2(5)Å 3 Centimeter-sized crystals were grown using evaporation, aqueous solution cooling, or hydrothermal methods. The ultraviolet absorption edge of these crystals is shorter than 200 nm, and the experimental birefringence is approximately 0.15 at 546 nm. This crystal preparation method is simple and low-cost, exhibiting significant nonlinear optical effects, a large birefringence, a wide transmission range, and ease of growth and processing. It can be used as an ultraviolet nonlinear optical crystal and a birefringent crystal.

This invention relates to a nonlinear optical crystal of guanidinoacetic acid chloride, its preparation method, and its uses. The crystal has the molecular formula C3N3O2H8Cl, a molecular weight of 153.57, belongs to the tetragonal crystal system, and has a space group of [missing information]. I 2 d The unit cell parameters are a =15.7150(13)Å, b =15.7150(13)Å, c =11.0742(15)Å, α =90.00° β =90.00° gamma =90.00° Z =16, V =2734.9(6)Å 3 Centimeter-sized crystals were grown using evaporation, aqueous solution cooling, or hydrothermal methods. Under 1064 nm laser irradiation, the crystal exhibited a frequency doubling response similar to that of potassium dihydrogen phosphate. The ultraviolet absorption edge of the crystal was approximately 250 nm, and the experimental birefringence was approximately 0.08 at 546 nm. This crystal preparation method is simple and low-cost, possesses significant nonlinear optical effects, a large birefringence, a wide transmission range, and is easy to grow and process. It can be used as an ultraviolet nonlinear optical crystal and a birefringent crystal.

This invention discloses a phosphorus compound, its nonlinear optical crystal, its preparation method, and its uses. The phosphorus-silicon-gallium-calcium compound and the phosphorus-silicon-aluminum-calcium compound of this invention can both be prepared using a high-temperature solid-state method. The phosphorus-silicon-gallium-calcium nonlinear optical crystal of this invention is CaGa3Si4P. 11 Phosphorus-silicon-aluminum-calcium nonlinear optical crystal CaAl3Si4P 11 Both belong to the hexagonal crystal system. The nonlinear optical crystals of phosphorus silicon gallium calcium and phosphorus silicon aluminum calcium of the present invention have large nonlinear optical effects (the frequency doubling output intensity is about 3.1 and 2.9 times that of AgGaS2 under the same conditions, respectively), wide optical band gap (2.41-2.49 eV), good infrared transmission performance in the 2.510 micrometer band, large nonlinear optical effects, good mechanical properties, and easy processing. They can be widely used in various nonlinear optical fields and the mid-infrared band.

This invention relates to a cesium hydroxyfluoroborate nonlinear optical crystal, its preparation method, and its uses. The crystal has the molecular formula CsB3O3F2(OH)2, belongs to the orthorhombic crystal system, and has the space group [missing information]. PCA 21, molecular weight 285.4, unit cell parameters are a =15.333(3)Å, b =6.176(4) Å, c =14.373(3)Å, α =90.00° β =90.00° c =90.00° Z =8, V =1361.1Å 3 The crystals are grown using room-temperature solvent evaporation or hydrothermal methods. This series of crystals has an ultraviolet transmission cutoff edge below 190 nm and an experimental birefringence of approximately 0.08 at 546 nm. The crystal preparation method is simple and low-cost, exhibiting significant nonlinear optical effects, a large birefringence, a wide transmission range, and ease of growth and processing. It can be used as an ultraviolet nonlinear optical crystal and a birefringent crystal.

This invention relates to imidazole trifluoroacetamidine nonlinear optical crystals, their preparation methods, and applications. The crystal has the molecular formula C(NH₂)₂CF₃(C₃N₂H₃), a molecular weight of 180.15, belongs to the orthorhombic crystal system, and has a space group of [missing information]. I 212121, cell parameters are a =8.781(1)Å, b =9.0684(9)Å, c =9.1540(8)Å, α =90.00° β =90.00° gamma =90.00° Z =4, V =728.93(13)Å 3 A millimeter-sized crystal was grown using an evaporation method and an aqueous solution cooling method. The crystal's ultraviolet absorption edge is shorter than 210 nm, and its experimental birefringence is approximately 0.12 at 546 nm. The preparation method is simple and low-cost, exhibiting significant nonlinear optical effects, a large birefringence, a wide transmission range, and ease of growth and processing. It can be used as an ultraviolet nonlinear optical crystal and a birefringent crystal.

The application discloses a fluorine-containing zirconium phosphate compound, a nonlinear optical crystal thereof and a preparation method and application thereof, and belongs to the technical field of inorganic functional crystal materials. The chemical formula of the fluorine-containing zirconium phosphate compound is ZrPO4F. The nonlinear optical crystal is composed of a [PO4] tetrahedron and a fluorine-containing zirconium coordination polyhedron to form a three-dimensional skeleton structure, zirconium is six-coordinated and forms a zirconium oxygen coordination polyhedron containing F; the nonlinear optical crystal is a non-centrosymmetric crystal; the nonlinear optical crystal is of an orthorhombic system; the space group of the nonlinear optical crystal is Pna 21; the cell parameters of the nonlinear optical crystal are a = 11.6094 (5) Å, b = 6.9038 (3) Å, c = 5.4921 (2) Å, α = β = γ = 90°, Z = 4, and the unit cell volume is V = 440.19 (3) Å 3 . The nonlinear optical crystal has a nonlinear optical effect, a large band gap (deep ultraviolet transparency), a wide transmission range and easy preservation, and is a nonlinear optical crystal material with great potential application value.

This invention relates to the compounds strontium lanthanum chloroborate and barium lanthanum chloroborate, as well as nonlinear optical crystals of strontium lanthanum chloroborate and barium lanthanum chloroborate, their preparation methods, and their uses. The general chemical formula for both the compounds and crystals is A3La4B3O. 13 Cl, where A = Sr, Ba, space group P63, belongs to the hexagonal crystal system, and cell parameter Z = 2. The compounds lanthanum strontium chloroborate and lanthanum barium chloroborate are synthesized by a solid-state reaction method. The nonlinear optical crystals of lanthanum strontium chloroborate and lanthanum barium chloroborate are grown using a high-temperature melt method. This material can be used to manufacture second harmonic generators, up-down frequency converters, optical parametric oscillators, etc.

The application relates to a novel infrared nonlinear optical crystal Ag4Ge3S7 and a preparation method thereof, and belongs to the field of inorganic materials. The Ag4Ge3S7 crystal has a non-centrosymmetric structure, belongs to a monoclinic system, a space group is Cc, a cell parameter is a=11.3613(3) angstrom, b=6.8380(2) angstrom, c=15.7941(4) angstrom, alpha=gamma=90 DEG, beta=93.032(2) DEG, a cell volume V=1225.30(6) angstrom 3 , and Z=4. The Ag4Ge3S7 crystal and a pure phase are prepared by a high-temperature solid-phase reaction method. Infrared nonlinear powder frequency doubling tests show that, under the irradiation of 2100nm laser as base frequency light, the Ag4Ge3S7 has strong nonlinear optical effect, and the signal strength is 1.15 times that of a classical infrared material AgGaS2; meanwhile, the Ag4Ge3S7 has a type of phase matching characteristics. The obtained infrared nonlinear optical crystal material Ag4Ge3S7 has potential application value in the field of infrared laser frequency conversion.

This application discloses a fluorinated zirconium phosphate compound, its nonlinear optical crystal, its preparation method, and its applications. The chemical formula of the fluorinated zirconium phosphate compound is Rb. x (NH4) y Zr4(H2PO4)F 21 Where 0≤x≤6, 0≤y≤6, and x+y=6. The nonlinear optical crystal is a one-dimensional chain structure formed by connecting [H2PO4] tetrahedra with [ZrF7] / [ZrOF7] fluorine-containing zirconium coordination polyhedra; the nonlinear optical crystal is a non-centrosymmetric crystal; the nonlinear optical crystal is an orthorhombic crystal system; the space group of the nonlinear optical crystal is... Pna 21; The unit cell parameters of a nonlinear optical crystal are a =13.6933(3)Å, b =15.2014(4)Å, c =11.4304(2)Å, α = β = γ =90°, unit cell volume V =2379.32(9)Å 3 This nonlinear optical crystal possesses both deep ultraviolet transparency and a strong second harmonic response. The fabrication method utilizes a hydrothermal reaction, which is simple and operates under mild conditions. The resulting nonlinear optical crystal can be used to construct nonlinear optical devices such as frequency multipliers, sum / difference frequency converters, and optical parametric oscillators.

The present invention provides a β-cesium cadmium silicon sulfide compound, a β-Cs2CdSi4S10 infrared nonlinear optical crystal, as well as their preparation methods and applications. The β-cesium cadmium silicon sulfide compound has a chemical formula β-Cs2CdSi4S10 and a molecular weight of 755.04. The β-Cs2CdSi4S10 infrared nonlinear optical crystal belongs to the tetragonal crystal system, its space group is I-4, and its unit cell parameters are: a=8.4233(7) Å, c=14.6136(12) Å, and the unit cell volume is 1036.86(19) Å3. The present invention adopts a vacuum packaging method to prepare a β-Cs2CdSi4S10 infrared nonlinear optical crystal. By using the kurtz-berry method, it was found that the frequency doubling effect of β-Cs2CdSi4S10 crystal is approximately 1.1-1.2 times that of AgGaS2(AGS). By using the UV-visible diffuse reflection, it was found that the β-Cs2CdSi4S10 crystal has the crystal bandgap of 4.21 eV, the UV cutoff edge of 254 nm, and the infrared transparency range greater than 13 μm. The preparation method of the β-Cs2CdSi4S10 infrared nonlinear optical crystal of the present invention is simple, with a short growth period, and avoids the leakage and contamination of raw materials. The β-Cs2CdSi4S10 infrared nonlinear optical crystal of the present invention can be used to fabricate conversion devices for high-power laser output applications and has important applications in atmospheric remote sensing and communication fields.

In an approach to quantum biosensing of signal cascades. The system includes a pump laser light source; a nonlinear optical crystal module; and an optical timing control; the system configured to: generate a two photon light; split the two photon light into a first photon light and a second photon light; generate a correlated single photon light by fixing a first timing of the first photon light and varying a second timing of the second photon light to achieve coincidence between the first photon light and the second photon light; excite a biomarker by the correlated single photon light to cause the biomarker to fluoresce; detect a biomarker fluorescence; and reconstruct a lifetime decay of a sample.

A laser assembly and a method for generating continuous-wave (CW) light at approximately 193 nm (between 180 nm and 200 nm) and at a power of 1 W or higher using two CW laser sources: one laser source generating first fundamental light that is twice frequency doubled or otherwise converted into first CW light having a first deep-ultraviolet (DUV) wavelength between 250 nm and 275 nm, the other laser source generating second CW light having an infrared (IR) wavelength between 1300 nm and 1700 nm. A resonant cavity receives the second CW light and generates enhanced CW light at 100 W or higher. A first non-linear optical (NLO) crystal mixes a first enhanced CW light portion and the first CW light to generate sum-frequency generation (SFG) light having a second DUV wavelength. A second NLO crystal mixes a second enhanced CW light portion and the SFG light to generate output CW light at approximately 193 nm.

The application relates to a 2-methyl imidazole germanium-based iodide second-order nonlinear optical crystal and preparation and application thereof. The chemical formula of the crystal material is (2-C4N2H7)GeI3, wherein 2 represents a substitution position of a methyl group on an imidazole ring, namely 2-methyl imidazole. The crystal material belongs to an orthorhombic system, a space group is Pna21, cell parameters are a=13.82~14.02 Å, b=9.47~9.67 Å, c=8.36~8.56 Å, alpha=beta=gamma=90 DEG, and Z=4. The powder frequency doubling effect of the nonlinear optical crystal (2-C4N2H7)GeI3 of the application under 1200 nm laser irradiation is about 5.8 times that of KH2PO4 (KDP), and phase matching can be realized. In addition, (2-C4N2H7)GeI3 has a large birefringence (0.38 @ 546 nm) and a large optical band gap (an absorption cutoff edge is about 420 nm, and an optical band gap size is 2.95 eV), and a millimeter-level single crystal is easy to grow. It can expand the wavelength range of a coherent light source through optical frequency conversion technologies such as second harmonic generation and optical parametric amplification, and exhibits important application values in the fields of laser frequency conversion and photoelectric information storage.

This invention relates to a series of tetrafluorohydroxyborate nonlinear optical crystals, their preparation methods, and applications. The general molecular formula of these crystals is A₂B₃O₃F₄OH, where A = K and Rb, both belonging to the orthorhombic crystal system, and the space group is [insert space group here]. Ama 2; The K2B3O3F4OH has a molecular weight of 253.7 and a unit cell parameter of [missing information]. a =25.931(3)Å, b =22.586(4)Å, c =7.4353(11)Å, α =90.00° β =90.00° γ =90.00° Z =24, V =4354.7Å 3 The Rb₂B₃O₃F₄OH has a molecular weight of 341.07 and a unit cell parameter of [missing information]. a =27.0111(31)Å, b =22.9321(10)Å, c =7.6140(3)Å, α =90.00° β =90.00° γ =90.00° Z =24, V =4716.3Å 3 The crystals are grown using room-temperature solvent evaporation or hydrothermal methods. The ultraviolet transmission cutoff edge of this series of crystals is below 190 nm; the experimental birefringence is approximately 0.05@546 nm. The preparation method is simple and low-cost, exhibiting significant nonlinear optical effects and birefringence. They are easy to grow and process, and can be used as ultraviolet nonlinear optical crystals and birefringent crystals.

A lead decahydroxydecaborate dihydroxy monoborate monohydrate nonlinear optical crystal, and its preparation method and application are provided. The chemical formula of this crystal is Pb2B10O16(OH)2·B(OH)3·H2O, its molecular weight is 892.35, and it belongs to the monoclinic crystal system, space group P21. The crystal is grown using a hydrothermal method in a closed system, or using a room temperature solution method in an open system.

The present application relates to a kind of compound barium lanthanum bromoborate and a kind of preparation method and purposes of barium lanthanum bromoborate nonlinear optical crystal, the chemical formula of the compound barium lanthanum bromoborate and its nonlinear optical crystal are all Ba 13 Br, the crystal belongs to hexagonal system, and space group is all P 63 mc , cell parameter is a=10.9580 (9) Å, b=10.7828 (6) Å, c=7.0412 (6) Å, V=732.22 (14) Å 3 , molecular weight is 1287.93, and the powder frequency doubling effect is about 6 times KDP (KH2PO4). Compound barium lanthanum bromoborate is synthesized using solid phase reaction method, barium lanthanum bromoborate nonlinear optical crystal is grown using high-temperature melt method or crystal is grown using pulling method, the crystal preparation method is simple, low in cost, and the crystal prepared has large mechanical hardness, and barium lanthanum bromoborate crystal obtained by the method is applied as nonlinear optical frequency doubling device.

The application relates to a 1-methyl imidazole germanium-based iodide second-order nonlinear optical crystal and preparation and application thereof. The chemical formula of the crystal material is (1-C4N2H7)GeI3, wherein 1 represents a substitution position of a methyl group on an imidazole ring, namely 1-methyl imidazole. The crystal material belongs to an orthorhombic system, a space group is Cmc21, cell parameters are a=7.92~8.12 Å, b=17.71~17.91 Å, c=8.08~8.28 Å, alpha=beta=gamma=90 DEG, and Z=4. The powder frequency doubling effect of the nonlinear optical crystal (1-C4N2H7)GeI3 of the application under 1200 nm laser irradiation is about 13 times that of KH2PO4 (KDP), and phase matching can be realized. In addition, (1-C4N2H7)GeI3 has a large birefringence (0.263 @ 546 nm) and a large optical band gap (the absorption cutoff edge is about 420 nm, and the optical band gap size is 2.95 eV), and a millimeter-level single crystal is easy to grow. It can expand the wavelength range of a coherent light source through optical frequency conversion technologies such as second harmonic generation and optical parametric amplification, and exhibits important application value in the fields of laser frequency conversion and photoelectric information storage.