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62 results about "Barium tetraborate" patented technology

Barium borate is an inorganic compound, a borate of barium with a chemical formula BaB2O4 or Ba(BO2)2. It is available as a hydrate or dehydrated form, as white powder or colorless crystals.

Laser beam generating apparatus

A laser beam in the ultraviolet region is generated at high power for along period. A green laser beam generated by a laser oscillator comes incident into a resonator from behind a first curved mirror, and circulates there, reflected by each mirror. By passing a barium borate crystal, it causes a secondary harmonic (a laser beam in the ultraviolet region) to be generated, which is taken out of the resonator via a second curved mirror. The beam waist of the laser beam passing the barium borate crystal is set to 46 mum, about double the conventional thickness, by adjusting the distance between the first curved mirror and a second flat mirror. As a result, the power density of the laser beam in the barium borate crystal is reduced to ¼ of the value according to the related art, and it is made possible to avoid rapid degradation of the barium borate crystal by excessive squeezing of the laser beam.
Owner:SONY CORP

Large size barium borate bismuth nonlinear optical crystal and preparation thereof

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.
Owner:XINJIANG TECHN INST OF PHYSICS & CHEM CHINESE ACAD OF SCI

Compound tetrahydroxy barium borate and tetrahydroxy barium borate nonlinear optical crystal as well as preparation method and application

The invention relates to a compound tetrahydroxy barium borate and a tetrahydroxy barium borate nonlinear optical crystal as well as a preparation method and an application. The molecular formula of the compound is Ba2[B6O9(OH)4] and the molecular weight is 551.57. The molecular formula of the crystal is Ba2[B6O9(OH)4]; the crystal belongs to a monoclinic system; the space group is P21; the molecular weight is 551.57; the tetrahydroxy barium borate nonlinear optical crystal can be obtained by adopting a hydrothermal process through a method of programmed cooling or naturally cooling; the nonlinear optical effect of the crystal is three times that of a KDP (Potassinm Dihydengen Phosphate) crystal; a light-transmitting wave band is 190nm-2500nm long; the growth process of the crystal is simple to operate and low in cost; and the applied reagent is inorganic raw material and has the advantages of low toxicity, short growth period and stable physico-chemical property. The tetrahydroxy barium borate nonlinear optical crystal disclosed by the invention is widely used in nonlinear optical devices such as frequency conversion and optical parametric oscillators.
Owner:XINJIANG TECHN INST OF PHYSICS & CHEM CHINESE ACAD OF SCI

Granules and method for producing same, production method for molten glass, and production method for glass article

The present invention relates to granules, which are a glass raw material mixture for the production of alkali-free glass containing substantially no alkali metal oxides, wherein the glass structure of glass obtained from the granules is, in mol% on an oxide basis, 60-75 mol% SiO2, 5-15 mol% Al2O3, 1-9 mol% B2O3, 0-15 mol% MgO, 0-20 mol% CaO, 0-12 mol% SrO, 0-21 mol% BaO, and more than 0 mol% for the total of CaO, SrO and BaO; and for which in an X-ray diffraction spectrum obtained by means of a CuKa X-ray powder diffraction, when the diffraction peak area of quartz (100) in which 2Theta is 19.85-21.71 degrees is taken as 1, the total of the relative value of the diffraction peak area of strontium borate hydrate in which 2Theta is 10.81-13.01 degrees, the relative value of the diffraction peak area of calcium borate hydrate in which 2Theta is 11.11-13.49 degrees, and the relative value of the diffraction peak area of barium borate hydrate in which 2Theta is in the range of 10.91-13.27 degrees, is at least 0.005. The present invention also relates to a production method for the granules, a method for producing molten glass using the granules, and a method for producing a glass article using the production method for molten glass.
Owner:AGC INC

Deep ultraviolet non-linear optical crystal of barium borate hydrate, preparation method therefor and use thereof

Provided area deep ultraviolet non-linear optical crystal of barium borate hydrate, a preparation method therefor and the use thereof. The chemical formula of the crystal is Ba2BHO22H7, belonging to monoclinic system, with the space group thereof being P21, the crystal cell parameters thereof being a=6.7719(10) Å, b=21.1195(4) Å, c=6.8274(10) Å, β=119.3950(10)° , and the molecular weight thereof being 752.65. The non-linear optical crystal of borate is obtained by means of programmed cooling or natural cooling using a hydrothermal method. The crystal powder has a frequency-doubled effect of about 2 times that of KDP (KH2PO4) and an ultraviolet cut-off edge of below 175 nm and can be used as a deep ultraviolet non-linear optical crystal. The growth process of the crystal has advantages such as simple, a low cost, a low toxicity, a short growth cycle, stable physical and chemical properties, etc. The deep ultraviolet non-linear optical crystal of barium borate hydrate Ba2B11O22H7 is widely used in the preparation of non-linear optical devices such as frequency doubling generators, upper frequency converters, lower frequency converters, optical parametric oscillators etc.
Owner:XINJIANG TECHN INST OF PHYSICS & CHEM CHINESE ACAD OF SCI

Chlorine barium borate, chlorine barium borate nonlinear optical crystal, and preparation method and uses of chlorine barium borate nonlinear optical crystal

The present invention relates to a compound chlorine barium borate, a chlorine barium borate nonlinear optical crystal, and a preparation method and uses of the chlorine barium borate nonlinear optical crystal. According to the present invention, the chemical formula of the compound is Ba7B3O11Cl, the molecular weight is 1205.26, and the compound is synthesized by adopting a solid phase reaction method; the chemical formula of the chlorine barium borate nonlinear optical crystal is Ba7B3O11Cl, the molecular weight is 1205.26, the crystal does not have the symmetry center and belongs to the hexagonal crystal system, the space group is P6[3]mc, and the cell parameters are as the follows: a is 11.2266 (17) angstrom, c is 7.214 (2) angstrom, Z is 2, and V is 787.4 (3) angstrom; the frequency doubling effect of the crystal powder achieves the 0.5 time of the KDP (KH2PO4); and the crystal has characteristics of large mechanical hardness, easy cutting, easy polish processing and easy preservation, and is widely applied in preparation of frequency doubling generators, frequency up-convertors, frequency down-convertors, or optical parameter oscillators and other nonlinear optical devices.
Owner:XINJIANG TECHN INST OF PHYSICS & CHEM CHINESE ACAD OF SCI

Rust proof coating for machinery equipment and preparation method thereof

The invention provides a rust proof coating for machinery equipment and a preparation method thereof. The coating contains the following components by weight: 30-45 parts of coal tar, 8-14 parts of maleic anhydride, 3-6 parts of modified phenolic resin, 10-20 parts of barium borate, 8-15 parts of molybdenum dioxide, 7-14 parts of aluminum tripolyphosphate, 1-3 parts of diatomite, 1-3 parts of kaolin, 1-3 parts of light calcium carbonate, 4-8 parts of propylene glycol, 0.6-1.1 parts of lead naphthenate, and 15-30 parts of deionized water. The coating provided by the invention has excellent rust resistance and wear resistance, hardly peels or blisters, has little environmental pollution, and can effectively protect the mechanical equipment, and prolong the service life of mechanical equipment.
Owner:SUZHOU JUKANG NEW MATERIAL TECH

Compound mono-boric dihydroxyl barium decaborate monohydrate nonlinear optical crystal and preparation method and use thereof

Provided are a deep ultraviolet non-linear optical crystal of barium borate hydrate, a preparation method therefor and the use thereof. The chemical formula of the crystal is Ba2B11O22H7, belonging to the monoclinic system, with the space group thereof being P2 1, the crystal cell parameters thereof being a = 6.7719(10)Å, b = 21.1195(4)Å, c = 6.8274(10)Å, β = 119.3950(10)°, and the molecular weight thereof being 752.65. The non-linear optical crystal of borate is obtained by means of programmed cooling or natural cooling using a hydrothermal method. The crystal powder has a frequency-doubling effect of about 2 times that of KDP(KH2PO4) and an ultraviolet cut-off edge of below 175 nm, and can be used as a deep ultraviolet non-linear optical crystal. The growth process of the crystal has advantages such as easy operation, a low cost, a low toxicity of raw materials, a short growth cycle, stable physical and chemical properties, etc. The deep ultraviolet non-linear optical crystal of barium borate hydrate Ba2B11O22H7 is widely used in the preparation of non-linear optical devices such as frequency doubling generators, upper frequency converters, lower frequency converters, optical parametric oscillators etc.
Owner:XINJIANG TECH INST OF PHYSICS & CHEM CHINESE ACAD OF SCI

Preparation method of barium metaborate nano-powder

InactiveCN101913619AOvercome granularityOvercome usabilityChemical industryBoratesFiltrationSolvent
The invention discloses a preparation method of barium metaborate nano-powder. The preparation method comprises the following steps of: A, weighing barium hydroxide and boric acid in a molar ratio of 1:2, uniformly mixing the barium hydroxide and the boric acid at room temperature, grinding the mixture from a solid state to a wet state and then from the wet state to a viscous state, and then continuously grinding the mixture for 1 to 1.5 hours; and B, baking and / or air-drying and / or roasting a product obtained in the step A to obtain low-temperature phase barium metaborate nano-powder with different crystalline state. In the preparation method, a low-temperature solid-state reaction method is adopted, the barium hydroxide and the boric acid are taken as raw materials, barium metaborate is prepared by grinding and one-step reaction; without solvent, surfactant, precipitating agent or operation steps such as suction filtration, vacuum drying, centrifugal separation and the like, complete conversion of the raw materials into products is directly realized, and the method has low energy consumption and low cost, is environment-free, and accords with requirements of green chemistry.
Owner:HEBEI UNIVERSITY

Strontium-doped barium borate ultraviolet double-refraction crystal and growing technology thereof

The invention relates to a strontium-doped barium borate ultraviolet double-refraction crystal and a preparation method thereof. The crystal has a molecular formula of Ba1-xSrxB2O4 (x=0.001- 0.23) and belongs to a trigonal system. The cell parameters of the space group R3c and Ba0.9Sr0.1B2O4 are within the transmission range of 190 to 3500 nm, the transmission rate of ultraviolet band reaches 90%, and the double refraction rate of the wavelength 533nm is: ne=1.5379, n0=1.6619, and the crystal can be used as ultraviolet double refraction crystal. The crystal is grown by using pulling method. The crystal can be widely used for Glan-Taylor and Glan-laser polarizers, especially for high-power ultraviolet polarizers.
Owner:FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI

Hydroxyalkylamide-cured outdoor type flame retardant powder coating

The invention discloses hydroxyalkylamide-cured outdoor type flame retardant powder coating which is prepared from the following components in parts by mass: 65 parts of outdoor polyester resin, 4 parts of a hydroxyalkylamide curing agent, 2 parts of a smooth degassing agent, 2 parts of a leveling agent, 5-10 parts of a compound flame retardant and 17-22 parts of pigments and fillers, wherein the compound flame retardant is prepared from the following raw materials in parts by weight: 5 parts of aluminum hydroxide, 5 parts of magnesium hydroxide, 16 parts of zinc borate, 32 parts of barium borate, 6 parts of antimony trioxide and 36 parts of diatom mud. The powder coating provided by the invention adopts the self-made compound flame retardant, so that the obtained coating has low thermal conductivity, can reduce the speed of heat transfer to a protected substrate, can also effectively isolate oxygen, increases heat absorption capacity, has excellent flame retardancy, and does not affect coating leveling, weather resistance, impact resistance and other properties.
Owner:六安捷通达新材料有限公司

Barium tetraborate compound and barium tetraborate non-linear optical crystal, and preparation method and use thereof

The present invention relates to a barium tetraborate compound and a barium tetraborate non-linear optical crystal, and a preparation method and use thereof, wherein the chemical formulae of the barium tetraborate compound and the non-linear optical crystal thereof are both BaB4O7, with a molecular weight of 292.58; the barium tetraborate non-linear optical crystal has a non-centrosymmetric structure, which belongs to a hexagonal system, and has a space group P65 and lattice parameters of a=6.7233(6) Å, c=18.776(4) Å, V=735.01(17) Å3, and Z=6, wherein the powder frequency-doubled effect thereof is two times that of KDP (KH2PO4), and the ultraviolet cut-off edge is lower than 170 nm. The barium tetraborate compound is synthesized by a solid-phase reaction method; the barium tetraborate non-linear optical crystal is grown by a high-temperature molten solution method; and the crystal has a moderate mechanical hardness, is easy to cut, polish and store, and is widely applicable in the non-linear optics of a double-frequency doubling generator, an upper frequency converter, a lower frequency converter or an optical parameter oscillator etc.
Owner:XINJIANG TECHN INST OF PHYSICS & CHEM CHINESE ACAD OF SCI

Molten-salt growth method for zinc oxide single crystal

This invention relates to the growth of zinc oxide (ZnO) single crystal by using molten-salt method. In this invention, the raw materials are: analytical agent barium oxide (BaO), boric acid (H3BO3) and specpure zinc oxide (ZnO). By using barium borate (BaB2O4) as fluxing agent, the invented single crystal is produce, with temperature reducing rate of 2-15 deg.C / d.
Owner:FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI

Nitric oxide sensor and method

A nitric oxide sensor and method is disclosed. The sensor is based on sum-frequency mixing of a tunable, 395-nm external cavity diode laser with a 532-nm diode-pumped intracavity-frequency-doubled Nd:YAG laser in a beta-barium-borate crystal. The output from the BBO crystal is ultraviolet radiation at 227 nm and is split using a 50—50 beam splitter. Half of the radiation is directed into a reference photomultiplier tube, and the other half of the UV radiation is directed through the medium of interest and then directed into a signal photomultiplier tube. The output from the photomultiplier tubes is compared and the difference utilized to indicate the level of nitric oxide by absorption-based spectrosocpic techniques.
Owner:AIR FORCE UNITED STATES OF AMERICA AS REPRESENTED BY STATES OF AMERICAS AS THE

Preparation method of nano barium borate sol and application thereof in polyester flame retardance

The invention discloses a preparation method of nano barium borate sol and application thereof in polyester flame retardance. The nano barium borate sol is prepared from barium hydroxide and boric acid through neutralizing reaction in a mixed solution of water and C2-C4 diol, wherein the highest concentration can reach 25% by weight, and the particle size is 5-80nm. The colloidal particles are dispersed uniformly, have good stability and do not form second agglomeration after long-time standing. The nano barium borate sol can be directly added into a polyester reaction system independently or after being compounded with other flame retardants, and a flame-retardant copolyester nano composite material is prepared through an in-situ polymerization way. Through the invention, the problems that the subsequence processing is difficult and the mechanical properties of materials are deteriorated seriously since an inorganic flame retardant with large powder particles is added for polyester flame retardance are solved. The preparation method disclosed by the invention has the advantages of low cost, simple process, easiness in realizing industrial production, high processability of the prepared material and the like, and brings obvious social and economic benefits.
Owner:曲铭海

Heat insulation anti-sticking coating for mechanical cast steel machining and preparation method of heat insulation anti-sticking coating

The invention discloses a heat insulation anti-sticking coating for mechanical cast steel machining and a preparation method of the heat insulation anti-sticking coating. The preparation method comprises the steps of weighing magnesia powder, meta-barium borate, water glass, N-methyl-2-pyrrolidinone, activated bentonite, dimethyl formamide, magnesium chloride, xylene, barium chloride, polytetrafluoroethylene, polyimide, ethyl acetate, aluminum paste and paint, feeding magnesia powder, activated bentonite and barium chloride into an edge runner, performing dry mixing, and adding water glass for mixed grinding; feeding polyimide, polytetrafluoroethylene, xylene, ethyl acetate and dimethyl formamide into a reaction kettle for uniform mixing to obtain a mixture, mixing the mixture with the mixed-ground raw materials, adding the rest of the raw materials, grinding the raw materials in a three-roller machine, and adjusting the viscosity. The relative density of a product is 16-18, and the product can be solidified at low temperature; the product can resist high temperature of 1,000-1,200 DEG C, cannot be separated, does not corrode metal equipment, protects steel materials from being oxidized, avoids decarbonization and can be widely produced to continuously replace the conventional material.
Owner:珠海市龙圣模具材料有限公司

Aqueous heat-insulation heat-preservation fireproof material and preparation method thereof

The invention discloses an aqueous heat-insulation heat-preservation fireproof material. The aqueous heat-insulation heat-preservation fireproof material is prepared from the following components in percentage by weight: 8 to 20 percent of nano silicon oxide composite material obtained by compounding structurally-controlled nano silicon oxide powder and a nano silicon oxide cake material with an ultrahigh specific surface area according to a proportion of 0.5:(1-5):1, 3 to 15 percent of glass micro-beads, 4 to 10 percent of nano titanium oxide, 1 to 8 percent of potassium titanate, 1 to 8 percent of titanium pyrophosphate, 1 to 3 percent of aluminum hydroxide, 1 to 3 percent of zinc borate, 1 to 3 percent of barium borate, 1 to 3 percent of calcium sodium metasilicate, 1 to 10 percent of aluminum silicate, 20 to 28 percent of acrylic hybrid emulsion, 1.5 to 3 percent of other assistants, and the balance of water. According to the aqueous heat-insulation heat-preservation fireproof material disclosed by the invention, the nano silicon oxide composite material obtained by compounding structurally-controlled nano silicon oxide powder and the nano silicon oxide cake material with the ultrahigh specific surface area as a core material, and by the components and corresponding optimized improvement of the proportions, the product has a good heat-flow stagnation function; and the heat conduction coefficient of the product is not more than 0.03W / (m.K), and the waterproof performance reaches A level.
Owner:上饶市安纳拓新材料有限公司

Ground-glaze-free low-temperature transmutation zirconium white glaze formula, preparation method and use method thereof

The invention belongs to the field of ceramic production and particularly relates to a ground-glaze-free low-temperature transmutation zirconium white glaze formula, a preparation method and a use method thereof. The ground-glaze-free low-temperature transmutation zirconium white glaze formula includes feldspar powder, boric acid, barium borate, limestone, zinc oxide, lead oxide, lead silicate and bentonite. The glaze is low in cost, is convenient to use, is low in sintering temperature and has a unique artistic feel. Glaze surface produced by sintering the ground-glaze-free low-temperature transmutation zirconium white glaze has a zirconium white dark light bottom color, wherein irregular black spots are uniformly distributed on the glaze surface. The size and distribution density of the black spots are changed according to the model of a ceramic product and glaze thickness. The glaze surface has a stone-like appearance and a slight flowing-tendency effect, thereby achieving unique artistic effects. Porcelain produced with the glaze is increased in grade and market price and is high in economic value. The glaze can be produced in large scale, can be popularized quickly and is simple in use, thereby achieving strong market competitiveness.
Owner:FUJIAN PROVINCE DEHUA COUNTY GRANGTOP CERAMICS CO LTD

Method of preparing barium yttrium borate and barium yttrium borate crystal and use thereof

The present invention discloses a preparation method and uses of a barium borate Yt crystal. Compared to the technology in existence, the monocrystal barium borate Yt in accordance with the present invention is characterized by its high luminescence intensity and light-emitting efficiency, sensitive responses and the like. Furthermore, in accordance with the present invention, said process can be used for getting barium borate Yt single crystal at conditions of air atmosphere and about 1019 DEG C, with mild experiment conditions and short reaction time; and the crystal obtained through the method possesses is characterized by its excellent quality, low material cost, simple equipment, being easy to extend. Said barium borate Yt crystal exhibits some characteristics such as high efficiency and quick-speed, when used for X-ray exploration.
Owner:INST OF PHYSICS - CHINESE ACAD OF SCI

Preparation method and application of barium-cesium borate nonlinear optical crystal

The invention relates to a preparation method and application of a barium-cesium borate nonlinear optical crystal. The chemical formula of the crystal is CsBaB9O15, the molecular weight is 607.54, thecrystal belongs to a monoclinic system, the space group is Cc3; cell parameters are that a=6.4918(4) angstroms, b=11.4075(6) angstroms, c=17.2571(9) angstroms, beta=92.375(3), Z is equal to 4, and Vis equal to 1276.88 (12) angstrom<-3>. A Bridgman-Stockbarger method is adopted to grow the large-size cesium barium borate crystal, a powder frequency multiplication test method is adopted to measurethe phase matching ability of the CsBaB9O15 crystal, the powder frequency multiplication effect is 3KDP, and the ultraviolet absorption edge is close to 175 nm; the CsBaB9O15 crystal is a harmonic generator capable of realizing the quadruplicated frequency and the quintuplicated frequency of Nd:YAG(1064nm). In addition, the CsBaB9O15 crystal is colorless and transparent, does not deliquesce in the air, is stable in chemical performance, can be widely applied to various nonlinear optical fields, and can develop nonlinear optical application of an ultraviolet band.
Owner:XINJIANG TECHN INST OF PHYSICS & CHEM CHINESE ACAD OF SCI

Point-wise phase matching for nonlinear frequency generation in dielectric resonators

An optical resonator fabricated from a uniaxial birefringent crystal, such as beta barium borate. The crystal is cut with the optical axis not perpendicular to a face of the cut crystal. In some cases the optical axis lies in the plane of the cut crystal face. An incident (input) electromagnetic signal (which can range from the infrared through the visible to the ultraviolet) is applied to the resonator. An output signal is recovered which has a frequency that is an integer multiple of the frequency of the input signal. In some cases a prism is used to evanescently couple the input and the output signals to the resonator.
Owner:CALIFORNIA INST OF TECH

Compound yttrium barium borate, yttrium barium borate nonlinear optical crystal and preparation method and application thereof

The invention relates to a compound barium yttrium borate, a barium yttrium borate nonlinear optical crystal and a preparation method and application thereof, wherein the chemical formulas of the compound and the crystal are BaYBO4, the crystal belongs to a hexagonal system, the space group cell parameter Z is 3, the molecular weight is 301.06, and the frequency-doubled effect of the crystal is about 3 times that of KDP (KH2PO4). The compound yttrium barium borate is synthesized by adopting a solid-phase reaction method, the yttrium barium borate nonlinear optical crystal grows by adopting a high-temperature melting method or a pulling method, the crystal preparation method is simple and low in cost, and the prepared crystal is high in mechanical hardness and easy to cut, polish, process and store. The barium yttrium borate crystal obtained by the method is applied as a nonlinear optical frequency doubling device.
Owner:TIANJIN UNIVERSITY OF TECHNOLOGY

Barium cesium borate nonlinear optical crystal, and preparation method and application thereof

The invention relates to a cesium barium borate nonlinear optical crystal, and a preparation method and application thereof. The crystal has a chemical formula of CsBa<3>B<11>O<20> and a molecular weight of 983.84, and belongs to an orthogonal system; the space group of the crystal is Cmc2<1>; and the cell parameters of the crystal are as follows: a is equal to 19.011(7) angstroms, b is equal to 10.837(4) angstroms, c is equal to 8.578(3) angstroms, Z is equal to 4, V is equal to 1767.4(11) angstroms, and Moh's hardness is 4-5. The crystal is prepared by using a flux method. The cesium bariumborate nonlinear optical crystal obtained by using the method is applied to preparation of nonlinear optical devices. The crystal has a large size which is at least at a centimeter level, and has theadvantages of high preparation speed, simple operation, low cost, large size, wide light transmission band, good mechanical properties, difficult fragmentation, stable physicochemical properties, easyprocessing and the like.
Owner:XINJIANG TECHN INST OF PHYSICS & CHEM CHINESE ACAD OF SCI

A kind of preparation method of barium chloroborate whisker

The present invention relates to a method for preparing barium chloroborate whiskers. The method comprises the following steps: (1) mixing a barium-containing compound, a boron-containing compound and a fluxing agent uniformly and then grinding to a particle size of less than 60 meshes to obtain a mixture; (2) The mixture is placed in a high-temperature furnace, heated to a temperature of 690-750°C at a heating rate of 5-10°C / min, heated at a constant temperature for 4-15 hours, and then cooled to room temperature naturally to obtain a sintered product; (3) the The sintered product is put into deionized water, soaked for 2-6 hours, filtered, washed and dried in sequence to obtain white powdery barium chloroborate crystal whiskers. The invention has simple process and low cost, and the obtained barium chloroborate crystal whisker has high purity and complete crystal structure.
Owner:QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI

Device for improving spot quality of non-linear crystal frequency-conversion laser

The invention discloses a device for improving spot quality of non-linear crystal frequency-conversion laser. The device comprises a non-linear crystal unit and a walk-off compensation crystal unit, wherein the non-linear crystal unit comprises a non-linear crystal which is composed of beta-barium borate crystals or caesium lithium borate; the walk-off compensation crystal unit comprises an uniaixal crystal which is composed of yttrium vanadate crystals or alpha-barium borate crystals. The device for improving the spot quality of the non-linear crystal frequency-conversion laser performs compensating and shaping treatment on laser spots frequency-converted by the non-linear crystal through the walk-off compensation crystal to obtain round laser spots under the premise of not losing the optical power of converting laser, thereby improving the spot quality. Meanwhile, the device for improving the spot quality of the non-linear crystal frequency-conversion laser is simple in operation, significant in effects, low in cost and capable of solving the technical problem of quality reduction of output laser spots.
Owner:福建科彤光电技术有限公司

Broadband optical parametric amplification method and device based on cascaded crystal

ActiveCN110187588AWide spectrumMake sure it keeps happeningNon-linear opticsMiddle infraredTime domain
The invention belongs to the technical field of ultrafast laser, and discloses a broadband optical parametric amplification method and device based on a cascaded crystal. The broadband optical parametric amplification method comprises the following steps: dividing the initial femtosecond laser into two beams, wherein the weaker beam passes through a pre-amplification stage to generate broadband seed light of a near-infrared band; the stronger beam acts as pumping light. The pumping light adjusts the time delay through a time delay line to be synchronous with the seed light in a time domain, and the pumping light and the seed light are combined by a dichroic mirror and are input into the cascade crystal together for optical parametric amplification. The cascade crystal comprises three II-type phase-matched barium borate crystals, the thicknesses and the phase matching angles of the three II-type phase-matched barium borate crystals are different, and the three II-type phase-matched barium borate crystals are used for amplifying different wave bands of the seed light. Through the amplification of the cascaded crystal, a broadband idler frequency spectrum can be efficiently obtained in a middle infrared band, and then the broadband idler frequency spectrum is compressed by a pulse compressor to finally obtain an ultrashort idler frequency light pulse with a period magnitude and astable carrier envelope phase.
Owner:HUAZHONG UNIV OF SCI & TECH

A kind of water-based thermal insulation and fireproof material and preparation method thereof

The invention discloses an aqueous heat-insulation heat-preservation fireproof material. The aqueous heat-insulation heat-preservation fireproof material is prepared from the following components in percentage by weight: 8 to 20 percent of nano silicon oxide composite material obtained by compounding structurally-controlled nano silicon oxide powder and a nano silicon oxide cake material with an ultrahigh specific surface area according to a proportion of 0.5:(1-5):1, 3 to 15 percent of glass micro-beads, 4 to 10 percent of nano titanium oxide, 1 to 8 percent of potassium titanate, 1 to 8 percent of titanium pyrophosphate, 1 to 3 percent of aluminum hydroxide, 1 to 3 percent of zinc borate, 1 to 3 percent of barium borate, 1 to 3 percent of calcium sodium metasilicate, 1 to 10 percent of aluminum silicate, 20 to 28 percent of acrylic hybrid emulsion, 1.5 to 3 percent of other assistants, and the balance of water. According to the aqueous heat-insulation heat-preservation fireproof material disclosed by the invention, the nano silicon oxide composite material obtained by compounding structurally-controlled nano silicon oxide powder and the nano silicon oxide cake material with the ultrahigh specific surface area as a core material, and by the components and corresponding optimized improvement of the proportions, the product has a good heat-flow stagnation function; and the heat conduction coefficient of the product is not more than 0.03W / (m.K), and the waterproof performance reaches A level.
Owner:上饶市安纳拓新材料有限公司
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