115results about How to "Wide band of light transmission" patented technology

The invention relates to a BaCa4Se7 compound, a BaCa4Se7 nonlinear optical crystal, a preparation method and application. The BaCa4Se7 compound is prepared by adopting a solid-phase reaction, and the BaCa4Se7 nonlinear optical crystal is grown by adopting a high-temperature melt spontaneous crystallization method, a flux growth method or a Bridgman method. In the growth of the BaCa4Se7 nonlinear optical crystal, the crystal is easy to grow and transparent and has no package and the advantages of higher growing speed, low cost, easy obtaining of a crystal in a larger size, and the like. The obtained BaCa4Se7 nonlinear optical crystal has the advantages of wider optical transparency range, larger hardness, good mechanical property, difficult cracking and deliquescence, easy processing and storage, and the like. The BaCa4Se7 nonlinear optical crystal can be used for preparing a nonlinear optical device.

The invention provides a compound cesium fluoborate, a nonlinear optical crystal with the cesium fluoborate, methods for preparing the compound cesium fluoborate and the nonlinear optical crystal and application of the compound cesium fluoborate and the nonlinear optical crystal. A chemical formula of the compound is CsB<4>O<6>F, the molecular weight of the compound is 291.15, and the compound is of a crystal structure and is prepared by the aid of solid-phase synthesis processes or vacuum packaging processes. A chemical formula of the nonlinear optical crystal is CsB<4>O<6>F, the molecular weight of the nonlinear optical crystal is 291.15, the nonlinear optical crystal belongs to orthorhombic crystal systems, space groups of the nonlinear optical crystal are Pna2<1>, crystal cell parameters of the nonlinear optical crystal include that an a is equal to 7.9241 , a b is equal to 11.3996 , a c is equal to 6.6638 and an alpha, a beta and a gamma are equal to 90 degrees, and the unit cell volumes of the nonlinear optical crystal are 601.95 <3>. Frequency doubling effects of the nonlinear optical crystal is approximately two times frequency doubling effects of KH<2>PO<4> [KDP (potassium dihydrogen phosphate)], and ultrasonic absorption edges of the nonlinear optical crystal are shorter than 190 nm. The nonlinear optical crystal is grown from the CsB<4>O<6>F by the aid of melt processes, high-temperature solution processes, vacuum packaging processes, hydrothermal processes or room-temperature solution processes. The compound cesium fluoborate, the nonlinear optical crystal, the methods and the application have the advantages that the nonlinear optical crystal is free of deliquescence in air, is good in chemical stability and can be applied to all-solid-state laser devices as an ultraviolet nonlinear optical crystal or deep ultraviolet nonlinear optical crystal.

The invention relates to a large-sized bismuth barium borate non-linear optic crystal, which belongs to the orthorhombic system with a space group equal to Pna21 and a molecular formula equal to BaBiBo4. The crystal is made from a mixed system of bismuth barium borate, fluxing agent Bi2O3 and BaB2O4, or BaO and Bi2O3; the nonlinear optical effect of the crystal is approximately five times of that of (KH2PO4) KDP; and the crystal is transparent within a wave band of between 200 and 3,000 nm, and has the large size with 1 to 100mmx1 to 100mmx1 to 100mm. The large-sized bismuth barium borate non-linear optic crystal has the advantages of quick making speed, simple operation, low cost, large-sized and transparent crystal made by the non-linear optic crystal, wide light-transmission wave band, ideal mechanical property, infrequent fragmentation, stable physicochemical properties, no deliquescence and easy processing and preservation; moreover, the non-linear optic crystal can be used to make non-linear optical devices such as a multiple frequency generator, an upper frequency converter or a lower frequency converter and an optical parametric oscillator.

The invention provides compound caesium potassium fluoborate and caesium potassium fluoborate non-linear optic crystal, and a preparation method and applications thereof. The chemical formula of the compound is CsKB8O12F2, the molecular weight is 488.48, and the compound is prepared via solid phase synthesis or vacuum packaging method. The chemical formula of the caesium potassium fluoborate non-linear optic crystal is CsKB8O12F2, the molecular weight is 488.48, the caesium potassium fluoborate non-linear optic crystal belongs to trigonal system, the space group is P321, the cell parameters a=b=6.598 angstroms, c=7.652 angstroms, alpha=beta=90 DEG, gamma=120 DEG, unit-cell volume is 288.5 angstroms, the frequency-doubled effect is about 2 times of that of KH2PO4(KDP), the UV absorption edge ranges from 150 to 200nm. Crystal growth of CsKB8O12F2 is realized via high temperature molten method, vacuum packaging method, hydrothermal method, or room temperature solution method; deliquescence of the crystal is not caused in the air; the chemical stability is excellent; and the crystal can be used in all-solid-state lasers as an ultraviolet, deep ultraviolet non-linear optic crystal.

The invention provides a compound caesium rubidium fluorborate, a caesium rubidium fluorborate nonlinear optical crystal, a preparation method and application. The compound has a chemical formula of CsRbB8O12F2 and a molecular weight of 534.86, and is prepared by solid phase synthesis or vacuum encapsulation method. The crystal has a chemical formula of CsRbB8O12F2 and a molecular weight of 534.86, belongs to hexagonal crystal system, has a space group of P-62c, the cell parameters of a=b=6.5878 angstrom, c=7.813 angstrom, alpha=beta=90 degrees, gamma=120 degrees, and a unit cell volume of 293.6 angstrom<3>. The frequency-doubled effect of the crystal is 2 times that of KH2PO4(KDP), and the ultraviolet absorption edge is 150-200nm. CsRbB8O12F2 adopts high temperature melt liquid method, vacuum encapsulation method, hydrothermal method or room temperature solution method for crystal growth, the crystal has the advantages of no deliquescence in the air and good chemical stability, and can be applied as ultraviolet and deep ultraviolet nonlinear optical crystal in all-solid-state lasers.

The invention relates to a Na3M2(BO3)3 nonlinear optical crystal as well as a preparation method and an application. The Na3M2(BO3)3 nonlinear optical crystal does not have the symmetric center and belongs to the orthorhombic system, and the space group is Amm2. Crystals are grown by a flux growth method, Na3M2(BO3)3, Na2CO3 and H3BO3 are prepared according to the mol ratio of 1 : (1-5) : (1-5) and then are put in a muffle furnace for heating and fusing; and then the fused materials are put in a single-crystal growth furnace, and the crystals are grown by a seed crystal method. The Na3M2(BO3)3 nonlinear optical crystal has the nonlinear optical effect with the size of one to three times of KDP(KH2PO4) and good machining property, is not easy to deliquesce and suitable for meeting the requirements on laser frequency conversion of blue and green optical bands, and can be used for preparing nonlinear optical elements; in addition, when an M part is replaced by rare-earth active ions, the single crystal can be used for preparing laser nonlinear optical compound functional devices.

The invention relates to a LiGaGe2Se6 compound, LiGaGe2Se6 nonlinear optical crystals, and a preparation method and an application thereof. The LiGaGe2Se6 compound is prepared through solid-phase reaction. The LiGaGe2Se6 nonlinear optical crystals are grown by using a high-temperature melt spontaneous crystallization method or a Bridgman-Stockbarger method. During the growth of the LiGaGe2Se6 nonlinear optical crystals, the crystals can easily grow bigger, and the crystals are transparent and are non-coated. The growth speed is high, the cost is low, and large-size crystals are easy to obtain. The obtained LiGaGe2Se6 nonlinear optical crystals has the advantages of relatively wide light transmittance band, relatively high hardness, good mechanical performance, resistances to fragmentation and deliquescence, easy processing, and easy storing. The LiGaGe2Se6 nonlinear optical crystals can be used for manufacturing nonlinear optical devices.

The invention relates to a BaGa2GeSe6 compound, a BaGa2GeSe6 non-linear optical crystal and their preparation methods and use. The BaGa2GeSe6 compound is prepared by a solid-phase reaction. The BaGa2GeSe6 non-linear optical crystal grows by a high-temperature melt spontaneous crystallization method or a Bridgman-Stockbarger method. In growth, the BaGa2GeSe6 non-linear optical crystal easily grows, is transparent and is not coated. The BaGa2GeSe6 non-linear optical crystal has the advantages of fast growth rate, low growth temperature, low cost, and easiness of production of large-size crystals. The BaGa2GeSe6 non-linear optical crystal has a wide light transmittance wave band, large hardness and good mechanical properties, is broken and air-slaked difficultly, and is processed and preserved easily. The BaGa2GeSe6 non-linear optical crystal can be used for manufacture of non-linear optical devices.

The invention relates to a BaGa2GeS6 compound, a BaGa2GeS6 nonlinear optical crystal, and a preparation method and application thereof. The BaGa2GeS6 compound is prepared by a solid reaction; and the BaGa2GeS6 nonlinear optical crystal is grown through a high-temperature melt spontaneous crystallization method or a Bridgman-Stockbarger method. In the growth of the BaGa2GeS6 nonlinear optical crystal, the crystal grows easily and is transparent without packaging; and the method has advantages of fast growth, cost low and easiness to obtain large size crystal, etc. The obtained BaGa2GeS6 nonlinear optical crystal has advantages of wide transmitting band, large hardness, good mechanical performance, invulnerability to break and deliquescence, and easiness to processing and preservation, and can be used in the production of nonlinear optical devices.

The invention relates to a K3Al2(PO4)3 non-linear optical crystal as well as a preparation method and application thereof. The crystal belongs to a rhombic system and has a space group of Pna21, and the cell parameters of the crystal are described in specifications of the invention. The preparation method of the crystal adopts a flux growth method to grow the crystal and mainly comprises the steps of: preparing materials of K3Al2(PO4)3:K2O:P2O5 by the molar ratio being 1: (0.5-1.5): (0.5-1.5); putting in a muffle furnace for heating and melting; and then putting in a single crystal growth furnace for growing the crystal by using a seed crystal method. The K3Al2(PO4)3 crystal has the advantages of large non-linear optical effect, wide light transmission range of 180-2500nm, good mechanical property, no deliquescence and easy processing and preservation and the like, can be used for preparing non-linear optical devices and meet the demands of frequency conversion of laser in a blue-green light band and an ultraviolet light band.

Discloses are a compound lithium rubidium germinate, a lithium rubidium germinate nonlinear optical crystal, a preparation method and applications. A chemical formula of the compound lithium rubidiumgerminate and the lithium rubidium germinate nonlinear optical crystal is LiRbGe2O5. The crystal belongs to an orthorhombic system, a space group is Pca21, a cell parameter is molecular weight 317.59,and power frequency doubling effect is about one time KDP(KH2PO4). The compound lithium rubidium germinate is synthesized by a solid phase reaction method. The lithium rubidium germinate nonlinear optical crystal is grown by a high temperature melt method or a czochralski method. The lithium rubidium germinate nonlinear optical crystal has high mechanical hardness, is prone to cutting, polishingprocessing and preservation, and is widely used in preparing frequency doubling generators, upper frequency converters, lower frequency converters, or optical parametric oscillators and other nonlinear optical devices.

The invention relates to a Li2In2SiS6 compound and a Li2In2SiS6 nonlinear optical crystal as well as preparation methods and applications thereof. The Li2In2SiS6 compound is prepared by performing a solid-phase reaction; the Li2In2SiS6 nonlinear optical crystal is prepared in a high-temperature melt growth manner by using a spontaneous crystallization method or a bridgman-stockbarger method; during the growth of the Li2In2SiS6 nonlinear optical crystal, the crystal is easy to grow up, transparent and not wrapped, so that the method has the advantages of rapid growth speed, low cost, easy obtainment of the large-size crystal and the like. The obtained Li2In2SiS6 nonlinear optical crystal has the advantages of being wide in light-pervious waveband, large in hardness, good in mechanical property, difficult to break and deliquesce, easy to machine and store and the like. Thus, the Li2In2SiS6 nonlinear optical crystal can be used for manufacturing a nonlinear optical component.

The invention relates to a Li2In2GeS6 compound and a Li2In2GeS6 nonlinear optical crystal as well as preparation methods and applications thereof. The Li2In2GeS6 compound is prepared by performing a solid-phase reaction; the Li2In2GeS6 nonlinear optical crystal is prepared in a high-temperature melt growth manner by using a spontaneous crystallization method or a bridgman-stockbarger method; during the growth of the Li2In2GeS6 nonlinear optical crystal, the crystal is easy to grow up, transparent and not wrapped, so that the method has the advantages of rapid growth speed, low cost, easy obtainment of the large-size crystal and the like. The obtained Li2In2GeS6 nonlinear optical crystal has the advantages of being wide in light-pervious waveband, large in hardness, good in mechanical property, difficult to break and deliquesce, easy to machine and store and the like. Thus, the Li2In2GeS6 nonlinear optical crystal can be used for manufacturing a nonlinear optical component.

The present invention relates to a BaGa2SiS6 compound, a BaGa2SiS6 nonlinear optical crystal, and a preparation method and application thereof. The BaGa2SiS6 compound is prepared by a solid reaction; and the BaGa2SiS6 nonlinear optical crystal is grown through a high-temperature melt spontaneous crystallization method or a Bridgman-Stockbarger method. In the growth of the BaGa2GeS6 nonlinear optical crystal, the crystal grows easily and is transparent without packaging; and the method has advantages of fast growth, cost low and easiness to obtain large size crystal, etc. The obtained BaGa2SiS6 nonlinear optical crystal has advantages of wide transmitting band, large hardness, good mechanical performance, invulnerability to break and deliquescence, and easiness to processing and preservation, and can be used in the production of nonlinear optical devices.

A BaHgSe2 nonlinear optical crystal has no symmetric center, and belongs to an orthorhombic system, the space group is Pmc21, and cell parameters of the crystal are characterized in that a is 0.436nm, b is 1.488nm, c is 0.759nm, alpha = beta = gamma = 90DEG, and Z = 4. A preparation method of the BaHgSe2 nonlinear optical crystal allows crystals to grow through adopting a high temperature melt spontaneous crystallization process or a Bridgman-Stockbarger method; and the crystals have the advantages of fast growth speed, low cost, and easy obtaining of crystals with large dimension in the growth process of the BaHgSe2 nonlinear optical crystal. The obtained BaHgSe2 nonlinear optical crystal has the advantages of large nonlinear optical effects, wide optical transparency waveband, large hardness, good mechanical performances and easy processing, and can be used to make a nonlinear optical device, and the device comprises a device allowing at least one beam of incident electromagnetic radiation to go through at least one BaHgSe2 nonlinear optical crystal in order to generate at least one beam of output radiation with the frequency different from the frequency of the incident electromagnetic radiation.

The invention relates to a compound fluorine cesium iodate and fluorine cesium iodate nonlinear optical crystal and a preparation method and application thereof. The chemical formula of a compound isCsIO2F2, and the molecular weight of the compound is 329.81. A hydrothermal method is adopted to prepare the crystal, the chemical formula of the crystal is CsIO2F2, the molecular weight of the compound is 329.81, the crystal belongs to an orthorhombic system, the space group is Pca 21, and according to cell parameters, a is equal to 8.781(3) angstrom, b is equal to 6.3771(18) angstrom, c is equalto 8.868(3) angstrom, alpha is equal to 90 degrees, beta is equal to 90 degrees, gamma is equal to 90 degrees, and V is equal to 496.6(2) angstrom<3>; the ultraviolet transmission cut-off edge is 272nm, the infrared transmission cut-off edge is 12 microns, the band gap is 4.5 eV, and the laser damage threshold value is 20 times that of AgGaS2. The nonlinear optical effect is about 3.5 times thatof KDP. The crystal has the advantages of simplicity in operation, low in cost, free of toxicity, short in growth period, stable in physical and chemical properties and the like, and can be widely applied to nonlinear optical devices such as frequency doubling conversion and optical parametric oscillators.

The invention relates to a Li6Cd5Sn4Se16 nonlinear optical crystal, and a preparation method and application thereof. The Li6Cd5Sn4Se16 nonlinear optical crystal does not have the center of symmetry, and belongs to an orthorhombic system of which the space group is Pna21; and the cell parameters are as follows: a=14.400A, b=8.3990A, c=6.7870A, and alpha=beta=gamma=90 degrees. The nonlinear optical crystal is grown by a high-temperature melt spontaneous crystallization process or crucible descent process. In the nonlinear optical crystal growth process, the crystal can easily grow up, is transparent without coating, has the advantages of higher growth rate, low cost and the like, and can easily obtain larger size. The nonlinear optical crystal has the advantages of wider transparent wave range, higher hardness, favorable mechanical properties, low tendency to cracking and deliquescence and the like, and is easy for processing and storage. The Li6Cd5Sn4Se16 nonlinear optical crystal can be used for manufacturing nonlinear optical devices.

The molten salt growing method of barium borophosphate meonocrystal includes the following steps: 1). uniformly mixing barium borophosphate and flux according to a certain ratio, heating to 900 deg.C-1100 deg.C, after thermostatic process cooling to 2-10 deg.C above saturation temp. to obtain mixed melt containing barium borophosphate and flux, the flux is BPO4-R system or Li4P2O7 flux, their mole ratio: barium borphosphate: BPO4-R system flux=1:0.2-1.5:0.1-0.6; and barium borophosphate: Li4P2O7 flux=1:0.2-1.6; and 2). placing the inoculating crystal mounted on the inoculating crystal bar in 0-100 rpm, cooling to saturation temp., slowly temp.-lowering to obtain required crystal, lifting said crystal body from level, reducing to room temp. so as to obtain the invented barium borophosphate monocrystal.

The invention relates to a compound rubidium sodium chloroborate, and a rubidium sodium chloroborate optical crystal and apreparation method and application thereof. The compound rubidium sodium chloroborate has a chemical formula of RbNa2B6O10Cl and a molecular weight of 391.76, and is synthesized by using a solid phase reaction method. The rubidium sodium chloroborate optical crystal has a chemical formula of RbNa2B6O10Cl and a molecular weight of 391.76, belongs to a orthorhombic crystal system and is located in space group P2<1>2<1>2<1>; cell parameters of the optical crystal are that a is equal to 8.3251(3) angstroms, b is equal to 9.6543(3) angstroms, c is equal to 12.7544(4) angstroms, Z is equal to 4, and V is equal to 1025.11(6) angstroms<3>; and the transmittance band of the optical crystal is in a range of 190 nm to 2600 nm. The rubidium sodium chloroborate optical crystal is grown by using a high temperature molten liquid method, has moderate mechanical hardness, and is easy to cut, polish, process and store, not soluble in water or prone to deliquescence, stable in the air and applicable to manufacturing optical devices like windows, lenses and prisms, e.g., windows, head-shields, fairings or the like used in infrared detectors and aircrafts; convex lenses used in microscopes and telescopes; and prisms used in periscopes, binoculars and the like for changing the heading direction of light.

The invention relates to lithium rubidium barium aluminum boron oxygen fluoride and lithium rubidium barium aluminum boron oxygen fluoride nonlinear optical crystal and a preparation method and use thereof. The lithium rubidium barium aluminum boron oxygen fluoride has a chemical formula of Rb3Ba3Li2Al4B6O20F and molecular weight of 1194.09 and is prepared through a solid reaction method. The lithium rubidium barium aluminum boron oxygen fluoride nonlinear optical crystal has a chemical formula of Rb3Ba3Li2Al4B6O20F, molecular weight of 905.82, belongs to a hexagonal system and a space group P-62c and has cell parameters of a=8.7017 (2) A, c=16.9807 (8) A and V=1113.51 (6) A<3>. The lithium rubidium barium aluminum boron oxygen fluoride is prepared through a solid reaction method. The lithium rubidium barium aluminum boron oxygen fluoride nonlinear optical crystal grows through a high temperature melt method, has powder frequency-doubling effect 1.5 times that of KDP(KH2PO4), has a UV cut-off edge of 190nm, has large mechanical hardness, can be cut, polished and stored easily, and can be widely used in nonlinear optical devices such as a frequency multiplication generator, an upper frequency converter, a lower frequency converter or an optical parametric oscillator.

The present invention relates to the melt growth process of sodium borophosphate crystal. Synthetic compound Na5[B2P3O13] is set inside crucible and sodium borophosphate crystal is then produced through pulling growth process, melt in fusion growth process or crucible descending growth process. The said process is simple in operation and can grow transparent Na5[B2P3O13] of 22x24x20 mm size and with wide light penetrating waveband, excellent mechanical performance, no deliquescence and other advantages.

The invention provides organic-inorganic hybrid strontium potassium tartrate tetrahydrate compound nonlinear optical crystal as well as a preparation method and application thereof. The compound has the molecular formula as follows: KSrC4BO12H10, belonging to the anorthic system and the P1 space group. The compound is prepared with an aqua-solution method, the nonlinear optical effect of the crystal is 1.5 times that of KDP crystal, the ultraviolet visible transmission band capable of realizing phase matching is from 250nm to 900nm, and the ultraviolet cutoff edge is about 230nm. The strontium potassium tartrate tetrahydrate nonlinear optical crystal can be applied to nonlinear optical devices for laser wavelength changing, optical parameters amplification, optical parametric oscillation, and the like.

A Na2In2GeSe6 nonlinear optical crystal and a preparation method and use thereof are disclosed; the Na2In2GeSe6 nonlinear optical crystal does not have the center of symmetry, belongs to monoclinic system, the space group is Cc, the unit cell parameters are as follows: alpha = gamma =90 degree, beta =108.70 degree, and Z= 4; the Na2In2GeSe6 can be grown by high-temperature melt spontaneous crystallization or crucible descending method; by the growth method of the Na2In2GeSe6 nonlinear optical crystal, the crystal is faster in growth rate and low in cost, a larger size crystal is easy to obtain; the resulting Na2In2GeSe6 nonlinear optical crystal has the advantages of large nonlinear optical effect, wide optical transparency band, large hardness, good mechanical properties, easy processing and the like; the Na2In2GeSe6 nonlinear optical crystal can be used to make non-linear optical components.

The invention relates to a Li2In2SiSe6 compound and a Li2In2SiSe6 nonlinear optical crystal as well as preparation methods and applications thereof. The Li2In2SiSe6 compound is prepared by performing a solid-phase reaction; the Li2In2SiSe6 nonlinear optical crystal is prepared in a high-temperature melt growth manner by using a spontaneous crystallization method or a bridgman-stockbarger method; during the growth of the Li2In2SiSe6 nonlinear optical crystal, the crystal is easy to grow up, transparent and not wrapped, so that the method has the advantages of rapid growth speed, low cost, easy obtainment of the large-size crystal and the like. The obtained Li2In2SiSe6 nonlinear optical crystal has the advantages of being wide in light-pervious waveband, large in hardness, good in mechanical property, difficult to break and deliquesce, easy to machine and store and the like. Thus, the Li2In2SiSe6 nonlinear optical crystal can be used for manufacturing a nonlinear optical component.

The present invention relates to a BaGa2SiSe6 compound, BaGa2SiSe6 nonlinear optical crystal and a preparation method and application. The BaGa2SiSe6 compound is prepared by a solid state reaction. The BaGa2SiSe6 nonlinear optical crystal grows by the high-temperature melt spontaneous crystallization method or the Bridgman-Stockbarger method. In the growth of the BaGa2SiSe6 nonlinear optical crystal, the crystal is easy to grow up and transparent without inclusions. The preparation method has the advantages of fast growth rate, low growth temperature, low cost, and easily available large size crystals. The BaGa2SiSe6 nonlinear optical crystal has the advantages of relatively wide light transmission band, high hardness, good mechanical properties, easy fragmentation and deliquescence, easy processing and preservation, etc. The BaGa2SiSe6 nonlinear optical crystal can be used for the production of non-linear optical devices.

The invention relates to a KYSiS4 compound, a KYSiS4 nonlinear optical crystal, a preparation method and an application. The KYSiS4 compound is prepared by adopting a solid-phase reaction; the KYSiS4 nonlinear optical crystal grows by adopting a high-temperature flux spontaneous crystallization method; during the growth of the KYSiS4 nonlinear optical crystal, crystal parts grow up easily, are transparent without being packaged, and have the advantages that the growth rate is higher, the cost is low, and the crystal in larger in size can be acquired easily; and the obtained KYSiS4 nonlinear optical crystal has the advantages of wider light-transmission wave band, higher hardness, good mechanical property, uneasiness in breaking or air-slaking, easiness in processing and storage, and can be used for manufacturing nonlinear optical devices.

The invention relates to a guanidine tetrafluoroborate nonlinear optical crystal and a preparation method and application thereof. The chemical formula of the crystal is [C (NH2) 3] BF4, the molecular weight is 146.89, the crystal belongs to a trigonal system, the space group is R3m, and the cell parameters are as follows: a = 7.4634 (10) angstroms, b = 7.4634 (10) angstroms, c = 9.1216 (19) (6) angstroms and Z = 3. The ultraviolet cut-off edge is 200 nm, the frequency doubling response is 4-5 times that of a commercial nonlinear optical crystal KDP, and the crystal with the centimeter-level size is grown by adopting a hydrothermal method, a room-temperature solution method, an evaporation method or a solvothermal method; the invention relates to the application of the crystal for preparing harmonic light output with frequency doubled or frequency tripled or frequency quadrupled or frequency quintupled or frequency sextupled of 1064 nm fundamental frequency light outputted by an Nd: YAG laser, or generating ultraviolet and deep ultraviolet frequency doubled light output lower than 200 nm, or for preparing a frequency doubled generator, an upper or lower frequency converter or an optical parametric oscillator. The crystal has the advantages of wide light-transmitting wave band, stable physical and chemical properties, high mechanical hardness, difficulty in fragmentation and deliquescence, easiness in cutting, polishing, processing and storage and the like, and has important application in the fields of optics, laser lithography and communication.

The present invention relates to large size nonlinear SrBPO5 optical crystal with size of (10-70)x(10-70)x(10-70) mm. It has wide transparent wavelength range of 190-3000 nm, negative monocrystal axis and Mohs' hardness 6.0. The growth process includes heating SrBPO5 in molar ratio, BPO4-R or Li4P2O7 as fluxing agent, maintaining and lower to the temperature 2-10 deg.c higher than the saturated temperature to obtain melt; setting the seed crystal in seed crystal rod inside the melt, maintaining for 0.5-6 hr, lowering to the saturated temperature fast, lowering the temperature in the rate of 0.2-5 deg.c / day, hoisting the crystal to over the liquid surface and lowering the temperature in the rate of 5-100 deg.c / hr to obtain the crystal. The crystal may be used in making double frequency generator, up and down frequency converter, optical parametric oscillator and other non-linear optical devices.

The invention relates to NaBa4Ga2B8O18Br3 and NaBa4Ga2B8O18Br3 non-linear optical crystal and a preparation method and application thereof. The chemical formula of the compound is NaBa4Ga2B8O18Br3, and molecular weight is 1,326.00. The compound is prepared by a solid-phase reaction method. The chemical formula of the NaBa4Ga2B8O18Br3 non-linear optical crystal is NaBa4Ga2B8O18Br3, and molecular weight is 1,326.00. The NaBa4Ga2B8O18Br3 non-linear optical crystal has a symcenter and belongs to the tetragonal system. Space group is P4(2)nm, and cell parameters are as follows: a=12.347(17)Angstrom, b=12.347(17)Angstrom, c=6.911(19) Angstrom, V=1,053(3)Angstrom<3>. The powder frequency-doubling effect is 2.1 times higher than powder frequency-doubling effect of KDP(KH2PO4). UV cut-off edge is 334nm. The crystal grows by a high temperature solution method. the NaBa4Ga2B8O18Br3 non-linear optical crystal prepared by the method has high mechanical hardness, is easy to cut, polish and store, and is widely applied in the preparation of non-linear optical devices such as a frequency doubling generator, an upper frequency converter, a lower frequency converter or an optical parameter resonator, etc.