362 results about "Nonlinear optical crystal" patented technology

The invention discloses an ultrafast coherent Raman spectrometer based on quantum entanglement photon enhancement and a light path device thereof, which realize ultrafast and high-resolution detection of a molecular vibration mode through integration of a quantum light source assembly, an ultrafast laser assembly, a light path assembly and a nonlinear crystal assembly and a high-sensitivity detection technology. By utilizing the characteristics of quantum entangled photons, the sensitivity and resolution of spectral measurement are improved, the system structure is simplified, and the cost is reduced. The quantum light source assembly adopts a nonlinear optical crystal to perform parametric down-conversion to generate entangled photon pairs. The ultrafast laser assembly generates femtosecond pulses, and the femtosecond pulses and the entangled photon pairs carry out nonlinear interaction. The light path assembly accurately controls the path and polarization state of photons to realize nonlinear Raman scattering of sample molecules. And the high-sensitivity detector is used for detecting and measuring the Raman light signal scattered by the sample. The invention aims to provide a spectral analysis method with high time resolution and high spectral resolution so as to realize ultrafast and high-resolution detection of a molecular vibration mode. According to the spectrograph, by utilizing the characteristics of quantum entangled photons, through entangled photon pairs generated by the nonlinear optical crystal, the sensitivity and resolution of spectral measurement are improved, and the problem of balance between time and spectral resolution in the prior art is solved.

The invention relates to a formamidine thiosulfate second-order nonlinear optical crystal and preparation and application thereof, the chemical formula of the crystal material is [CH (NH2) 2] 2SO3S, the molecular weight is 203.27, the crystal material belongs to an orthorhombic crystal system, the space group is P212121, the unit cell parameter is # imgabs 0 # alpha = beta = gamma = 90 degrees, Z = 4, and the unit cell volume is # imgabs 1 #. Under 1064nm laser irradiation, the frequency doubling intensity of the powder is about two times that of monopotassium phosphate crystals, and phase matching can be realized. In addition, the crystal material has a wide light transmission wave band, the ultraviolet absorption cut-off edge is 253 nm, the optical band gap is 4.90 eV, and the crystal material is easy to grow. The wavelength range of the coherent light source can be expanded by using optical frequency conversion technologies such as second harmonic generation and optical parametric amplification. Therefore, the crystal material has important application value in the fields of laser frequency conversion, photoelectric information storage and the like.

The invention relates to an erbium-doped, ytterbium-doped or erbium-ytterbium co-doped lithium niobate crystal as well as a preparation method and application thereof, and belongs to the field of nonlinear optical crystals. The erbium-doped, ytterbium-doped or erbium-ytterbium co-doped lithium niobate crystal provided by the invention is prepared from Li2CO3, Nb2O5 and Er2O3 and / or Yb2O3 with the purity of 99.99%; wherein the atomic molar ratio of Li to Nb is 0.80-0.92, and the doping molar fraction of Er2O3, the doping molar fraction of Yb2O3 and the total doping molar fraction of Er2O3 and Yb2O3 are respectively 0.75%-1.25%. The erbium-doped, ytterbium-doped or erbium-ytterbium co-doped lithium niobate crystal prepared by the invention is high in crystallization quality, large in doping concentration, uniform and transparent as a whole and free from obvious macroscopic defects, and can be used for preparing a high-quality lithium niobate bulk material and a submicron lithium niobate film so as to further prepare high-efficiency photoelectric functional devices such as a laser, an amplifier and a detector; and a foundation is laid for development of the fields of integrated photonics and the like.

The invention relates to a compound selenium-indium-cesium and a selenium-indium-cesium infrared nonlinear optical crystal as well as a preparation method and application thereof. The molecular formula of the compound is CsIn5Se8, the molecular weight is 1338.69, the molecular formula of the crystal is CsIn5Se8, the molecular weight is 1338.69, the structure has an asymmetric center and belongs to a triclinic system, the space group is P1, and the cell parameters are as follows: a is 9.1506 (3), b is 9.1793 (3), c is 11.2778 (3), alpha is 89.9560 (10) degrees, beta is 72.0140 (10) degrees, gamma is 72.0340 (10) degrees, Z is 2, and the volume is 852.38 (5) 3. The crystal is prepared by adopting a high-temperature melt method, a chemical vapor transport method, a Bridgman-Stockbarger method or a fluxing agent method. The obtained selenium-indium-cesium infrared nonlinear optical crystal has the advantages of large nonlinear optical response, good crystal growth habit, good mechanical property, difficulty in fragmentation and deliquescence, easiness in processing and storage and the like, and can be used for manufacturing infrared nonlinear optical devices; the method has important application in the fields of photoelectric countermeasure, spectrum technology, laser communication, remote sensing distance measurement and the like.

According to the technical scheme, the second harmonic laser direct writing system comprises a control system and a sensor module, the control system comprises an embedded controller and a closed-loop control system, the embedded controller is responsible for receiving sensor data and sending a control instruction, the closed-loop control system is used for adjusting the temperature and the angle in real time through the sensor data, and the temperature and the angle are adjusted in real time. And control software based on machine learning or an optimization algorithm, a temperature sensor is used on the sensor module to monitor the temperature of the nonlinear optical crystal in real time, an optical sensor monitors the intensity and phase of fundamental frequency light and second harmonic light, and an angle sensor monitors and feeds back the cutting angle of the crystal. An optimized nonlinear optical crystal phase matching technology is adopted, phase matching of fundamental frequency light and second harmonic light is ensured by accurately adjusting the cutting angle and temperature of the crystal, in addition, the stability of a laser light source is improved through improved design, the conversion efficiency of the second harmonic light is improved, and the laser output power is enhanced.

The invention discloses an ytterbium ion doped samarium calcium oxide borate nonlinear optical crystal and a preparation method and application thereof.The crystal belongs to a monoclinic system, an m point group and a Cm space group, the chemical formula is YbxSm1-xCa4O (BO3) 3, the chemical formula is 0.1-0.99, the cell parameters are as follows: a = 8.064-8.110, b = 16.045-16.062, c = 3.570-3.600, alpha = gamma = 90 degrees and beta = 100.80-101.38 degrees, and the ytterbium ion doped samarium calcium oxide borate nonlinear optical crystal has good crystal quality and transmittance as high as 87% and can be applied to high-power laser devices, such as laser devices, laser devices, laser devices and the like. The method is widely applied to the fields of photoetching machines, laser medical treatment, laser cutting and the like, and the preparation method has the advantages of being low in cost, high in quality, stable in performance, suitable for large-scale production and the like.

Apparatuses, systems and methods for all-optical computing are disclosed. An optical computing apparatus includes a nonlinear optical crystal, at least one light source, and a detector. The at least one light source is configured to spatially modulate vectors of operand values onto coherent optical radiation and to direct the spatially modulated coherent optical radiation into the nonlinear optical crystal, thereby exciting propagating modes in the nonlinear optical crystal corresponding to a computational result of linear and nonlinear operations performed over the vectors. The detector is coupled to receive and sense the coherent optical radiation that has propagated through the nonlinear optical crystal so as to decode the computational result.

The invention relates to a nonlinear optical crystal structure, a preparation method thereof and optical equipment. The nonlinear optical crystal structure comprises a plurality of material layers which are stacked in the direction perpendicular to the two-dimensional plane of the material layers. Each material layer is of a crystal structure with y-weight rotational symmetry and has a predetermined crystal lattice direction in a direction parallel to a two-dimensional plane; a non-zero deflection angle is formed between the adjacent material layers, and the deflection angle is an included angle of the preset crystal lattice directions of the adjacent material layers; wherein y is 1, 2, 3, 4 or 6. According to the nonlinear optical crystal structure and the preparation method thereof, the rotational symmetry crystals are stacked, and nonlinear enhancement of second harmonics and even higher harmonics is achieved by controlling the deflection angle between the material layers. Compared with a traditional nonlinear metasurface scheme, the nonlinear optical crystal structure can achieve higher accuracy, higher operability and higher efficiency.

The invention relates to an aminoguanidine oxalate second-order nonlinear optical crystal material and preparation and application thereof, the chemical formula of the crystal material is (CN4H7) + (C2O4H)-, the crystal material belongs to a monoclinic system, the space group is P21, the cell parameters are # imgabs0 # and # imgabs1 #, alpha is equal to 90 degrees, beta is equal to 95-100 degrees, gamma is equal to 90 degrees, and Z is equal to 2. The powder frequency-doubled effect of the nonlinear optical crystal (CN4H7) + (C2O4H)-disclosed by the invention under the irradiation of 1064nm laser is about 1.0 time of that of a KH2PO4 (KDP) crystal, and phase matching can be realized. In addition, the crystal material has the advantages of being short in ultraviolet absorption cut-off edge (290 nm), easy to grow and the like, and has important application value in the photoelectric conversion fields of stereolithography, solid-state lasers, optical communication, optical parametric amplifiers, optical parametric oscillators, laser frequency converters and the like.

The invention relates to a trimethylamine methanesulfonate second-order nonlinear optical crystal material and preparation and application thereof, the chemical formula of the crystal material is [(CH3) 3NH] < + > [SO3CH3] <->, the molecular weight is 154.21, the crystal material belongs to an orthorhombic crystal system, and the space group is Pca21 (No.29). According to the present invention, the powder frequency doubling effect of the nonlinear optical crystal [(CH3) 3NH] + [SO3CH3]-under 1064nm laser irradiation is about 0.5 time of the powder frequency doubling effect of the nonlinear optical crystal [(CH3) 3NH] + [SO3CH3]-under 1064nm laser irradiation, phase matching can be achieved, and the ultraviolet absorption cutoff edge is less than 200nm. The crystal material is easy to grow and shows important application value in the aspects of electro-optical modulation, holographic storage elements, frequency doubling devices and the like.

A nonlinear optical crystal structure is provided. The nonlinear optical crystal structure includes a plurality of two-dimensional material films, wherein the plurality of two-dimensional material films are stacked in a direction perpendicular to a two-dimensional plane thereof, and two-dimensional material films adjacent to each other are bonded by van der Waals forces, each of the plurality of two-dimensional material films is a crystal with a center-inversion-asymmetric crystal structure, and has a predetermined lattice orientation parallel to the two-dimensional plane in a direction parallel to the two-dimensional plane, there is a non-zero twist angle between the two-dimensional material films adjacent to each other, and the twist angle is an included angle between predetermined lattice orientations of the two-dimensional material films adjacent to each other in the same two-dimensional plane, and a thickness of each of the plurality of two-dimensional material films is greater than 5 nm.

The invention relates to the technical field of laser, in particular to a neodymium-doped garnet activated medium continuous wave yellow laser which comprises an excitation source, a focusing system, a laser medium crystal, a nonlinear optical crystal and a laser resonant cavity. The laser medium crystal and the nonlinear optical crystal are positioned in the laser resonant cavity; the laser resonant cavity is composed of an input mirror and an output mirror, and one side of a mirror cavity is plated with a dielectric film of a corresponding wave band. Pump light emitted by an excitation source is collimated by a focusing system, then enters a laser resonant cavity through an input mirror and is incident on a laser medium crystal, the laser medium crystal absorbs pump energy to generate energy level transition, and electron-phonon coupling laser is generated; and after the electron-phonon coupled laser is subjected to frequency conversion through the nonlinear optical crystal, continuous wave yellow laser is output from one end of the output mirror. The device has the characteristics of simple structure, high working stability and high temperature adaptability.

The invention provides a compound guanidine fluoroborate and a guanidine fluoroborate nonlinear optical crystal as well as a preparation method and application, the chemical formula of the compound is [C (NH2) 3] 3B3O3F6, the molecular weight is 370.66, a room temperature solution method is adopted, the molecular weight of the guanidine fluoroborate nonlinear optical crystal is 370.66, the crystal belongs to a monoclinic system, the space group is Pc, and the cell parameters are as follows: a = 8.5366 (10), b = 11.5066 (12), c = 9.2274 (9), alpha = 90 degrees, beta = 122.682 degrees and gamma = 90 degrees. And the unit cell volume is 762.883. And growing the crystal by adopting a room-temperature solution method or a hydrothermal method. The crystal has good chemical stability, and can be used as a short-wavelength nonlinear optical crystal in an all-solid-state laser.

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.

The invention relates to the technical field of lasers, in particular to an all-solid-state continuous wave vacuum ultraviolet laser adopting double resonant cavities, which is characterized in that a first cavity mirror M1, a first laser crystal C1, a fourth cavity mirror M4, a fifth cavity mirror M5 and a sixth cavity mirror M6 form a first laser resonant cavity; the second cavity mirror M2, the second laser crystal C2, the third cavity mirror M3, the fourth cavity mirror M4, the fifth cavity mirror M5 and the sixth cavity mirror M6 form a second laser resonant cavity; the first nonlinear optical crystal O1 is arranged between the fifth cavity mirror M5 and the sixth cavity mirror M6, and is used for performing frequency doubling on the 526-nm laser generated by the first resonant cavity into 263-nm frequency-doubled laser; the second nonlinear optical crystal O2 is arranged between the fourth cavity mirror M4 and the fifth cavity mirror M5, frequency sum is carried out on 725nm fundamental frequency laser generated by the second resonant cavity and 263nm frequency doubling laser generated by the first nonlinear optical crystal O1, and 193nm vacuum ultraviolet laser is generated and output through the fourth cavity mirror M4. The internal structure is simple, and the frequency conversion frequency is low.

The invention relates to a nonlinear optical crystal and crystal combined adhesive and a preparation method thereof. The nonlinear optical crystal and crystal combined adhesive comprises the following components in parts by weight: 40-70 parts of hydrogenated bisphenol A type acrylate monomer; 20 to 40 parts of a polyfunctional thiol compound; the core of the core-shell structure nanoparticles is ZrO2, the shell of the core-shell structure nanoparticles is SiO2, the particle size of the core is 20-50nm, and the thickness of a shell layer is 3-8nm; and 0.1 to 0.5 part of a coupling agent containing a phosphate group. Through accurate regulation and control of the ZrO2atSiO2 core-shell nanoparticles, the refractive index of the adhesive can be adjusted in a range of 1.65-2.10, and is highly matched with the refractive index 1.7-2.2 of nonlinear optical crystals such as KTP, BBO and LBO, so that the Fresnel loss of a bonding interface is reduced to be less than or equal to 0.5 dB / cm, the laser frequency conversion efficiency is remarkably improved, agglomeration is effectively inhibited by the core-shell structure of the nanoparticles, and the laser frequency conversion efficiency is improved. The light transmittance of a cured adhesive layer under common laser wavelengths such as 1064 nm, 532 nm and 355 nm is larger than or equal to 99.5%, the adhesive layer is suitable for a high-power laser system, by adding the quantum dot material, the refractive index matching of the specific wavelength can be further optimized, and the application scene is expanded.

The invention belongs to the technical field of biomedical detection, and discloses a Raman spectrum analysis device for quantitative detection of hematologic tumor markers, which comprises a blood collection centrifugal unit with a self-adaptive load regulation mechanism for monitoring blood density and components in real time, centrifugal force and time parameters are automatically adjusted according to the blood density and components; the optical fiber Raman spectrometer is provided with an automatic wavelength calibration system, and an ultrafast laser pulse transmitter and a high-sensitivity photon counting detector are integrated on the optical fiber Raman spectrometer. Raman scattering signals are enhanced by adopting a quantum entanglement light source and a nonlinear optical crystal; according to the invention, the detection capability on low-concentration tumor markers can be obviously improved. Due to the improvement, the device can accurately detect the existence of the tumor marker at the early stage of cancer, and powerful support is provided for early treatment of a patient.

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 provides a compound cesium sodium fluoborate, a cesium sodium fluoborate nonlinear optical crystal and a preparation method and application thereof, the chemical formula of the compound is NaCs7 [B3O3F4 (OH)] 4 (H2O) 3, the molecular weight is 1701.16, and the compound is prepared by a room temperature solution method; the chemical formula of the crystal is NaCs7 [B3O3F4 (OH)] 4 (H2O) 3, the molecular weight is 1701.16, the crystal belongs to a monoclinic system, the space group is P21, the cell parameters are as follows: a is equal to 11.5864 (15), b is equal to 13.463 (2), c is equal to 12.5958 (19), alpha is equal to 90 degrees, beta is equal to 90 degrees, gamma is equal to 109.697 (5) degrees, the unit cell volume is 1849 (5) 3, the crystal is grown by adopting a room temperature solution method or a hydrothermal method, the chemical stability of the crystal is good, and the crystal can be used as a short-wavelength nonlinear optical crystal to be applied to an all-solid-state laser.

The invention relates to the technical field of laser output, and discloses a dual-wavelength laser output system, which comprises a first laser used for generating laser of a first wavelength; the second laser is used for generating laser with a second wavelength; the edge computing node is configured at a position close to the first laser and the second laser and is responsible for performing real-time processing and analysis on the laser data of the first wavelength and the second wavelength; the distributed computing framework is used for fragmenting the laser data and distributing the fragmented laser data to a plurality of edge computing nodes for processing; and the nonlinear optical crystal is configured on the laser output path and is used for converting and synthesizing the laser of the first wavelength and the laser of the second wavelength. Multi-wavelength output is realized through double lasers and a nonlinear optical crystal, real-time data processing and fault detection are carried out by utilizing an edge computing node, efficient data processing, storage and flexible deployment are ensured through a distributed computing framework and a database, and the stability and accuracy of the system are improved.

The invention relates to application of biguanide carbonate or biguanide nitrate as a nonlinear optical crystal, in particular to application of the biguanide carbonate or the biguanide nitrate as the nonlinear optical crystal to realize ultraviolet frequency doubling laser output. Through experimental tests, the frequency-doubled effect of the biguanide nitrate powder is about 3.5 * KDP, and the ultraviolet cut-off edge is about 318nm; the frequency-doubled effect of the biguanide carbonate powder is about 5 * KDP, the ultraviolet cutoff edge is about 258 nm, and compared with the frequency-doubled effect of the guanidine phosphate which is 1.5 * KDP, the second-order nonlinear optical performance of the biguanide carbonate and the biguanide nitrate is greatly improved; the two crystals are stable in air and high in product purity, and compared with a layered growth habit of a potassium boron beryllium fluoride crystal, the growth speed is high, a large-size transparent single crystal is easy to grow, and the two crystals can be applied to an all-solid-state laser as ultraviolet and ultraviolet solar-blind nonlinear optical crystals.

The invention belongs to the field of nonlinear optical materials, and relates to an ultraviolet nonlinear optical crystal material and a preparation method and application thereof. The chemical formula of the ultraviolet nonlinear optical crystal material is Zn (C5H4NO) 2, C5H4NO represents 4-hydroxypyridine, and the 4-hydroxypyridine and Zn < 2 + > are combined through a coordinate bond to form a [ZnN2O2] tetrahedron; the crystal belongs to an orthorhombic system, and the space group is Fdd2. The band gap of the ultraviolet nonlinear optical crystal material is 4.40 eV, the second harmonic generation is as high as 13.6 * KDP, the birefringence delta n = 0.073 at the wavelength of 532 nm, the birefringence delta n = 0.074 at the wavelength of 1064 nm, and the ultraviolet nonlinear optical crystal material presents a photoluminescence characteristic, and has phosphorescence with the service life of 558 ms and blue afterglow visible to naked eyes and as long as 5 s under exciting light with the wavelength of 330-420 nm. In addition, the ultraviolet nonlinear optical crystal material has very strong water resistance, thermal stability and environmental stability, and has a good application prospect in the field of nonlinear optical materials.

The invention discloses a method for preparing a block alpha-HgS nonlinear optical crystal through chemical vapor transport cyclic heat treatment and application of the block alpha-HgS nonlinear optical crystal. The preparation method comprises the following steps: by taking HgS powder as a material source, carrying out chemical vapor transport cycle heat treatment for one-time growth to obtain alpha-HgS crystals; and recrystallizing the alpha-HgS crystal through chemical vapor transport cycle heat treatment, and carrying out secondary growth to prepare the alpha-HgS single crystal. According to the invention, cyclic heat treatment is carried out by adopting a secondary growth chemical vapor transport method, millimeter-scale alpha-HgS red crystal and beta-HgS black crystal are successfully grown, reversible phase change exists between the two crystals, and reversible transformation from black beta-HgS to red alpha-HgS can be promoted through temperature change in a mass transfer process by temperature control. The alpha-HgS single crystal has excellent nonlinear optical properties, can be used for frequency doubling crystals in a near-infrared band, and shows excellent laser damage resistance.

The invention discloses a method for growing a large-size CLBO crystal by using a new fluxing agent, and belongs to the field of nonlinear optical crystals. The adopted new fluxing agent is Cs2O-Li2O-B2O3-YF3, and the large-size CLBO crystal can be obtained through growth by a high-temperature solution top oriented seed crystal growth method. According to the novel fluxing agent, the solution viscosity can be effectively reduced, and crystal defects are reduced; and the grown large-size CLBO crystal has the advantages of high transmittance, strong deliquescence resistance and the like, and can be used as a frequency doubling device of an ultraviolet laser.

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 present invention relates to the technical field of lasers, and particularly relates to an all-solid-state continuous-wave vacuum ultraviolet laser using a double resonant cavity. A first cavity mirror M1, a first laser crystal C1, a fourth cavity mirror M4, a fifth cavity mirror M5, and a sixth cavity mirror M6 form a first laser resonant cavity; a second cavity mirror M2, a second laser crystal C2, a third cavity mirror M3, the fourth cavity mirror M4, the fifth cavity mirror M5, and the sixth cavity mirror M6 form a second laser resonant cavity; a first nonlinear optical crystal O1 is disposed between the fifth cavity mirror M5 and the sixth cavity mirror M6 to frequency-double the 526-nm laser generated by the first resonant cavity into a 263-nm frequency-doubled laser; a second nonlinear optical crystal O2 is disposed between the fourth cavity mirror M4 and the fifth cavity mirror M5 to sum-frequency the 725-nm fundamental-frequency laser generated by the second resonant cavity and the 263-nm frequency-doubled laser generated by the first nonlinear optical crystal O1 to generate a 193-nm vacuum ultraviolet laser, which is output through the fourth cavity mirror M4. The present invention has a simple internal structure and requires fewer frequency conversion times.

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.