177 results about "Nonlinear optical crystal" patented technology

The invention provides a preparation method and application of a compound cesium ammonium fluoborate and a cesium ammonium fluoborate nonlinear optical crystal. The chemical formula of the compound is CsNH4B8O12F2; the chemical formula of the crystal is CsNH4B8O12F2, the crystal belongs to a trigonal system, the space group is P321, and the unit cell parameters are as follows: a = b = 6.5858 (4) + / -0.02, c = 7.8163 (6) + / -0.02, alpha = beta = 90 degrees, gamma = 120 degrees and Z = 1. The crystal is grown by adopting a vacuum high-temperature solution method, a room-temperature solution method or a hydrothermal method, and the ultraviolet transmission cut-off edge of the crystal is lower than 190 nm. The nonlinear optical effect of the crystal is about 2.5 times of that of KH2PO4 (KDP), and the shortest I-type phase matching wavelength is 175.5 nm. The crystal has the advantages of simple preparation method, low toxicity of used initial raw materials, small harm to human bodies, stable physical and chemical properties, uniaxial crystal, easiness in application and the like. The method can be widely applied to nonlinear optical devices such as ultraviolet and deep ultraviolet all-solid-state lasers, optical parametric oscillators and the like.

This invention relates to a compound, magnesium gallium selenide (MgHgGa4Se8), and a magnesium gallium selenide (MgHgGa4Se8) infrared nonlinear optical crystal, along with their preparation methods and applications. The compound has the molecular formula MgHgGa4Se8 and a molecular weight of 1135.46 g / mol. The crystal, also with the molecular formula MgHgGa4Se8 and a molecular weight of 1135.46 g / mol, lacks a center of symmetry, belongs to the tetragonal crystal system, and has a space group of MgHgGa4Se8. Its cell parameters are α = β = γ = 90°, Z = 1, and its volume is determined by the high-temperature melt method, chemical vapor transport method, or crucible lowering method. This crystal exhibits advantages such as significant nonlinear optical effects, good crystal growth habit, good mechanical properties, high hardness, resistance to breakage and deliquescence, and ease of processing and storage. It can be used to fabricate infrared nonlinear optical devices, which have important applications in optoelectronic warfare, laser communication, and medical fields.

The invention relates to a novel second-order nonlinear optical crystal-potassium cadmium germanate (K4Cd3Ge4O13), and belongs to the field of optical crystal materials. The crystal is prepared by adopting a high-temperature solid-phase method and a high-temperature solution method, belongs to an orthorhombic crystal system and a C2 space group, is accurate in measurement of cell parameters, and shows excellent nonlinear optical characteristics and a wide light transmission range. The ultraviolet cut-off edge of the crystal is 261 nm, the infrared spectrum permeability is not obviously reduced in the range of 4000-714 cm <-1 >, the transmission range of the crystal can effectively cover a key atmosphere transmission window of 3-5 microns, and the crystal has powder frequency doubling response equivalent to that of a KDP crystal and can be applied to an all-solid-state laser as a mid-infrared nonlinear optical crystal.

The invention belongs to the technical field of nonlinear optical crystals, and particularly relates to a zeolite-like structure nitrogen oxide silicate nonlinear optical crystal and a preparation method and application thereof, the chemical general formula of the crystal is Ba3Si3N5OCl, the crystal belongs to a hexagonal system, the cell parameters of the crystal are as follows: a is 9.5147 (6), c is 5.5002 (4), V is 431.22 (6) 3, Z is 2, the space group is P-62c, and the crystal has a non-centrosymmetric structure. The Ba3Si3N5OCl crystal provided by the invention is used as a novel zeolite-like structure nitrogen oxide silicate, successfully integrates nonlinear optical activity and phase matching capability, can generate frequency doubling response which is about 0.2 times of KDP (potassium dihydrogen phosphate) under 1064 nm laser pumping, and can realize phase matching, so that the Ba3Si3N5OCl crystal becomes a nonlinear optical material with practical device application potential.

This invention relates to a potassium hydroxyborate nonlinear optical crystal, its preparation method, and its applications. The crystal has the chemical formula K₂B₅O₈(OH), a molecular weight of 277.26, belongs to the orthorhombic crystal system, and has a space group of [missing information]. Pca 21, with unit cell parameters a=8.5523(8)Å, b=7.3326(7)Å, c=12.9739(10)Å, α=β=γ=90°, V=813.60(13)Å. 3 A nonlinear optical crystal composed of potassium hydroxyborate can be obtained using a mild hydrothermal (solvothermal) method through programmed or natural cooling. The frequency doubling effect of this crystal powder is approximately twice that of KDP (KH₂PO₄), and its ultraviolet cutoff edge is below 200 nm, making it suitable as a deep-ultraviolet nonlinear optical crystal. The crystal growth process offers advantages such as simple operation, low raw material toxicity, short growth cycle, low cost, and stable physicochemical properties. It has been widely applied in the fabrication of nonlinear optical devices such as frequency doubling generators, up- or down-frequency converters, or optical parametric oscillators.

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.

The present invention relates to a rubidium fluoro-scandium borate compound, a rubidium fluoro-scandium borate nonlinear optical crystal, and a preparation method and application thereof. The rubidium fluoro-scandium borate compound has a chemical formula Rb2ScB3O6F2, does not contain a symmetry center and has a molecular weight of 382.33 g / mol. The rubidium fluoro-scandium borate nonlinear optical crystal belongs to the monoclinic crystal system, and belongs to the non-centrosymmetric space group P21, and the unit cell parameters are: a=4.0372(10) Å, b=11.800(3) Å, c=8.823(2) Å, α=γ=90°, β=98.327(11)°, Z=2. The present invention adopts a high-temperature vacuum packaging method or a solid-state synthesis method to prepare rubidium fluoro-scandium borate compounds. The present invention adopts a fluxing agent method to prepare a rubidium fluoro-scandium borate nonlinear optical crystal, which have the advantages of short absorption cutoff edge, large nonlinear optical effect, good thermal stability, and stable physical and chemical properties. The rubidium fluoro-scandium borate nonlinear optical crystal of the present invention can be used to fabricate nonlinear optical devices, which have important applications in fields such as optics, military, laser lithography, and communication, etc.

To provide an SHG (second harmonic generation) capable of emitting a laser beam having a wave length shorter than that of 215nm.SOLUTION: The SHG device 1 has an optical crystal layer made of a nonlinear optical crystal, a lower DBR layer disposed on the lower surface of the optical crystal layer, and an upper DBR layer disposed on the upper surface of the optical crystal layer. The lower DBR layer has a double structure of a lower first 1DBR layer disposed on the optical crystalline layer side and a lower second 1DBR layer disposed under the lower first 2DBR layer. The second harmonic reflectivity of the lower 1DBR layer is higher than the second harmonic reflectivity of the lower 2DBR layer. The lower 2DBR layer has a reflectivity for the fundamental wave higher than that of the lower 1DBR layer. The second harmonic generated in the optical crystal layer is emitted through the upper DBR layer.SELECTED DRAWING: Figure 1

A method for fabricating a nonlinear optical waveguide with gradient refractive index distribution, in which a nonlinear optical crystal is prepared; a type of first heavy ions, a type of second heavy ions and parameters related to an irradiation process are determined; the first heavy ions are accelerated to generate a first ion beam; the nonlinear optical crystal is bombarded with the first ion beam to obtain a primary processed crystal; the second heavy ions are accelerated to generate a second ion beam; the primary processed crystal is bombarded with the second ion beam to obtain a secondary processed crystal; and the secondary processed crystal is segmented to obtain the desired optical waveguide.

The present application relates to a nonlinear optical crystal structure, a preparation method thereof and an optical device. The nonlinear optical crystal structure includes a plurality of material layers stacked in a direction perpendicular to a two-dimensional plane thereof. Each of the material layers has a crystal structure with y-fold rotational symmetry, and has a predetermined lattice direction parallel to the two-dimensional plane, where y is an integer in a range from 1 to 20. Adjacent material layers have a nonzero twist angle therebetween, and the twist angle is an angle between the predetermined lattice directions of the adjacent material layers.

The invention discloses a sulfur-arsenic-strontium-sodium compound and a sulfur-arsenic-strontium-sodium nonlinear optical crystal as well as a preparation method and application thereof. The chemical formula of the sulfur-arsenic-strontium-sodium nonlinear optical crystal is Na4SrAs2S8, the sulfur-arsenic-strontium-sodium nonlinear optical crystal is of a non-centrosymmetric structure and belongs to a tetragonal system, and a space group is that cell parameters are alpha = beta = gamma = 90 degrees, Z = 2 and V = 701.57 (5). The sulfur-arsenic-strontium-sodium nonlinear optical crystal provided by the invention has a relatively large nonlinear optical coefficient and relatively wide transmission wave band and band gap. Meanwhile, the crystal meets the same-component melting characteristic, is easy to grow, cut, grind, polish and preserve, is stable in air, is not easy to deliquesce and is insoluble in water, so that the crystal is expected to become a new-generation novel middle-infrared band nonlinear optical material with excellent comprehensive performance, and can be effectively applied to a wide-spectrum-range tunable laser system.

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 invention discloses a processing method of a CLBO crystal with high surface shape precision, and belongs to the field of nonlinear optical crystals. The method comprises three procedures of cutting, heat treatment and polishing. The method comprises the following steps: firstly, cutting an oriented CLBO crystal under the cooling of cutting oil, then, carrying out heat treatment annealing on the cut crystal in an inert atmosphere, and finally, carrying out rough polishing, fine polishing and cleaning on the CLBO crystal subjected to heat treatment annealing to obtain the CLBO crystal with high surface shape precision. According to the processing method disclosed by the invention, the problems of deliquescence cracking and low processing surface shape precision in the processing of the CLBO crystal are effectively solved through a method for eliminating processing stress through heat treatment, inhibiting deliquescence by combining anhydrous polishing and water polishing and improving the polishing precision.

The invention relates to a niobium tantalum oxyfluoride acid ammonium salt second-order nonlinear optical crystalline material and preparation and application thereof, the chemical formula of the material is (NH4) 5 (NbOF4) (TaF7) 2, the crystalline material belongs to a tetragonal system, the space group is I4cm, and the cell parameters are alpha = beta = gamma = 90 degrees and Z = 2. Under 1064nm laser irradiation, the powder frequency-doubled effect of the nonlinear optical crystal (NH4) 5 (NbOF4) (TaF7) 2 can reach 3.5 times that of a KH2PO4 (KDP) crystal, under 532nm laser irradiation, the powder frequency-doubled effect of the nonlinear optical crystal (NH4) 5 (NbOF4) (TaF7) 2 is 0.35 times that of a beta-BaB2O4 (BBO) crystal, and phase matching can be realized. In addition, the ultraviolet absorption cutoff edge of the crystalline material is less than 195 nm, and the crystalline material shows moderate birefringence (0.095 at-546 nm). The crystalline material provided by the invention has important application value in the photoelectric fields of solid-state lasers, spectral analysis, precision manufacturing, optical communication and the like.

The present invention relates to compounds and their nonlinear optical (NLO) crystals of A3B11P2O23 (A=K, Rb, Cs, NH4), their producing method and uses thereof. The series of compounds have a chemical formula of A3B11P2O23 (A=K, Rb, Cs, NH4), which are namely K3B11P2O23, Rb3B11P2O23, Cs3B11P2O23 and (NH4)3B11P2O23. The series of NLO crystals having the chemical formula of A3B11P2O23 (A=K, Rb, Cs, NH4), 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. A3B11P2O23 (A=K, Rb, Cs, NH4) compounds were prepared by a solid-state reaction method or a hydrothermal method, and A3B11P2O23 (A=K, Rb, Cs, NH4) NLO crystals were prepared by a high-temperature solid-state reaction method, a hydrothermal method, or a solution method. T They meet the requirements for the frequency conversion of UV wavelength lasers and could be used to prepare nonlinear optical devices.

The invention discloses a preparation method of a large-size nonlinear optical crystal NaI3O8, and belongs to the technical field of nonlinear optical crystal preparation. The large-size nonlinear optical crystal NaI3O8 is successfully prepared by taking iodine pentoxide and sodium nitrate as raw materials and adopting a hydrothermal synthesis method by controlling the raw material ratio and the cooling rate, the preparation method is simple, and the crystal is short in growth cycle, large in size and high in purity. Hazardous substances such as nitric acid are not adopted, the preparation process is safe, meanwhile, the method does not increase structural and process complexity, preparation is convenient, and environmental pollution is not increased. A Q-switched Nd: YAG laser is used for outputting laser with the wavelength of 1064nm as fundamental frequency light, the obtained NaI3O8 crystal material is subjected to a powder frequency doubling test, and a result shows that the crystal material has a relatively strong frequency doubling effect.

The invention belongs to the field of nonlinear optical crystal materials, and particularly relates to a nonlinear optical crystal and a preparation method and application thereof. The chemical formula of the nonlinear optical crystal is Zn4EuO (BO3) 3, the nonlinear optical crystal belongs to a monoclinic system, the space group is Cm, and the cell parameters are that alpha is equal to 90 degrees, beta is equal to 100.193 degrees, and gamma is equal to 90 degrees. The crystal disclosed by the invention has good SHG performance and fluorescence performance at the same time; a frequency doubling signal of the crystal is about 4 times that of a KDP sample; the fluorescent material emits red light, the service life of the Eu (5D0) state of the fluorescent material is about 1.43 milliseconds under the conditions that lambda ex and um are equal to 464 and 610 nm, and the fluorescent material is a potential luminescent material emitting red light. In addition, the optical band gap of the crystal is 3.46 eV, and the crystal has extremely high thermal stability which can reach 1100 DEG C.

This invention relates to a germanium-based chiral perovskite second-order nonlinear optical crystalline material, its preparation and application, wherein the chemical formula of the material is ( R -C7H 10 NO)GeI3 and ( S -C7H 10 NO)GeI3, where R -C7H 10 NO is a (R)-2-(1-hydroxyethyl)pyridine cation. S -C7H 10 NO is a (S)-2-(1-hydroxyethyl)pyridine cation. This crystal belongs to the hexagonal crystal system, space group [space group number missing]. P 63, cell parameters a =17.0~18.0 Å, b =17.0~18.0 Å, c =7.0~8.0 Å, unit cell volume V =2000~2200 Å 3 , α = β =90°, gamma =120° Z= 2. Under 1200 nm laser irradiation, the nonlinear optical crystal of the present invention ( R -C7H 10 NO)GeI3 and ( S -C7H 10 The frequency doubling effect of GeI3 powder is 15 times that of KH2PO4; under 2000 nm laser irradiation, the frequency doubling effect of the crystalline material powder is 1.0 times that of KTiOPO4, and both can achieve phase matching. The crystalline material also has a large birefringence, wherein ( R -C7H 10 NO)GeI3 is 0.518 @ 546 nm, ( S -C7H 10 The NO)GeI3 has a wavelength of 0.529 nm at 546 nm and a moderate optical band gap (2.68 eV). The crystalline material of this invention shows significant engineering application value in nonlinear optical applications such as near-infrared laser frequency conversion, optical parametric amplification, and electro-optic signal processing.

The invention discloses a metal halide nonlinear optical crystal and a preparation method thereof, and relates to a nonlinear optical crystal and synthesis preparation thereof. The invention aims to solve the technical problem that the existing method is difficult to synthesize the metal halide of the mixed anions. The chemical formula of the metal halide nonlinear optical crystal is Rb2CdCl2I2, the structure of the nonlinear optical crystal does not have a symmetric center, the nonlinear optical crystal belongs to an orthorhombic system, the space group is I4mm, and the cell parameters are that a is equal to 5.31210 (10), b is equal to 5.31210 (10), c is equal to 17.7062 (10) and Z is equal to 2. The crystal is prepared by using a solution volatilization spontaneous crystallization method at 33-37 DEG C, has the advantages of low growth temperature, high crystal purity, good crystal quality, broad band gap of 3.70 eV, high laser damage threshold of 19 * AgGaS2, and ultra-wide light transmission range of 0.35-103.2 [mu] m, and can be used in the field of infrared laser.

The invention provides a lead titanium tellurate second-order nonlinear optical crystal and a preparation method and application thereof, and belongs to the technical field of optical crystal materials. The compound is prepared by a solid-phase synthesis method and a fluxing agent method, and the preparation method comprises the step of growing the titanium lead tellurate nonlinear optical crystal by adopting the fluxing agent method. The obtained product has the advantages of large frequency-doubled effect, large optical band gap, wide transmission range, stable physical and chemical properties and difficulty in deliquescence, and can be used for preparing near-intermediate infrared nonlinear optical frequency conversion devices.

The application provides a niobium phosphate nonlinear optical crystal and preparation and application thereof. 12 Nb3P7O 31 , belongs to an orthorhombic system, a space group is Pna21, is a non-central symmetric structure, cell parameters are: a=0.5 nm, b=1.0 nm, c=0.5 nm, and Z=4, has a large nonlinear optical effect (3xKDP), is phase-matched, a theoretical indirect band gap is 5.11 eV, has a large laser damage threshold, a wide transmission range, stable physical and chemical properties, good mechanical properties, is not easy to deliquesce, and is easy to preserve, and can be used as a ferroelectric crystal, a pyroelectric crystal or a laser substrate material, and is widely applied in preparation of middle infrared laser nonlinear optical composite functional devices, piezoelectric devices, laser frequency conversion devices and the like.

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 method for preparing a nonlinear optical material and its application, specifically a magnesium aminodiacetate dihydrate compound. The molecular formula of the crystal is Mg[NH2(CH2COO)2]·2H2O. The Mg[NH2(CH2COO)2]·2H2O crystal does not have a center of symmetry, belongs to the tetragonal crystal system, has a space group of P-421c, and has cell parameters of α=β=γ=90°, Z=2. The nonlinear optical crystal of this invention has a large frequency doubling effect; at the same time, its ultraviolet absorption edge is 225nm, thus belonging to the tetragonal crystal system, with a space group of P-421c and cell parameters of α=β=γ=90°, Z=2. The nonlinear optical crystal can achieve the second harmonic of Nd:YAG (λ=1.064μm); and it can be predicted that the Mg[NH2(CH2COO)2]·2H2O crystal can be used in the third harmonic generator of Nd:YAG.

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.

Disclosed herein is a single nonlinear optical crystal having a chemical formula of RnBa3(B3O6)3 wherein R is n different rare earth elements selected from La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, and any combination thereof; and wherein n is 1 to 14. Also disclosed are devices comprising the same and methods of making the same.

The present application relates to a nonlinear optical crystal structure, a preparation method thereof and an optical device. The nonlinear optical crystal structure includes a plurality of material layers stacked in a direction perpendicular to a two-dimensional plane thereof. Each of the material layers has a crystal structure with y-fold rotational symmetry, and has a predetermined lattice direction parallel to the two-dimensional plane, where y is an integer in a range from 1 to 20. Adjacent material layers have a nonzero twist angle therebetween, and the twist angle is an angle between the predetermined lattice directions of the adjacent material layers.

The application belongs to the field of nonlinear optical materials, and relates to a kind of ultraviolet nonlinear optical crystal material and its preparation method and application.The crystal chemical formula of the ultraviolet nonlinear optical crystal material is Zn (C5H4NO) 2, C5H4NO represents 4-hydroxy pyridine, 4-hydroxy pyridine is combined with Zn 2+ Form [ZnN2O2] tetrahedron by coordination bond;The crystal belongs to the orthorhombic system, and the space group is Fdd2.The band gap of the ultraviolet nonlinear optical crystal material is 4.40eV, the second harmonic generation is as high as 13.6xKDP, the birefringence Δn at 532nm wavelength is 0.073, the birefringence Δn at 1064nm wavelength is 0.074, and it shows photoluminescence characteristics, has phosphorescence with a lifetime of 558ms under the excitation light with a wavelength of 330-420nm, and blue afterglow with a naked eye visible and a duration of 5s.In addition, the ultraviolet nonlinear optical crystal material has strong water resistance, thermal stability and environmental stability, and has good application prospect in the field of nonlinear optical materials.

The invention discloses a compound rubidium antimony aluminum silicate and a preparation method and application of a rubidium antimony aluminum silicate nonlinear optical crystal, the chemical formula of the compound rubidium antimony aluminum silicate and the crystal of the compound rubidium antimony aluminum silicate is Rb5Sb4AlSi4O22, the crystal belongs to an orthorhombic system, the space group is that the cell parameter Z is 2, and the molecular weight is 1405.67. The compound rubidium antimony aluminum silicate is synthesized by adopting a high-temperature solid-phase reaction method, the rubidium antimony aluminum silicate nonlinear optical crystal grows by adopting a high-temperature solution method, the preparation method is simple, convenient and low in cost, and the obtained crystal has the advantages of wide light transmission range, stable physical and chemical properties, easiness in storage and the like, and can be used for preparing nonlinear optical devices.

The application provides a nonlinear optical crystal, a preparation method and application thereof, and has the chemical formula Y(C6H5SO3)3.9H2O, wherein the compound has good nonlinear optical performance, a band gap of 4.35eV, an ultraviolet cutoff edge near 285nm, a frequency doubling response of about 0.8 times of KH2PO4 (KDP), a shortest phase matching wave band near 300nm, good crystal growth habit, and simple preparation process and low preparation cost; the nonlinear optical crystal can be used for frequency conversion of laser output, the shortest phase matching wavelength is less than 300nm, and can produce 2 times frequency doubling harmonic output on a laser beam with a wavelength of 1064nm; meanwhile, the crystal can be used for a harmonic generator from an infrared region to an ultraviolet region, an optical parametric and amplifier device, an optical waveguide device and a nonlinear optical device, can meet a larger frequency doubling coefficient, has larger birefringence, and has wide application in the field of nonlinear optics.