Chinese Academy of Sciences

Xinjiang Technical Institute of Physics and Chemistry, Cas

Shilie Pan

Fangfang Zhang

Xueling Hou

Yu Chen Zhou

Xiaoming Duan

Qianqian Hao

Xin He

Yingjie Shen

Linjun Li

Min Zhang

Hongping Wu

Yuqiang Yang

Jian Han

Miriding Mutailipu

Xinglong Chen

Hui Zhang

Ying Chu Wang

Feng Li

Zheng Cui

Hongsheng Shi

Ming Xia

Zhaohong Miao

Yun Yang

Xiangzhan Jiang

Zhaohui Chen

Hongwei Yu

Xuefei Wang

Guoqiang Shi

A nonlinear optical crystal of guanidinium tetrafluoroborate has a chemical formula of [C(NH)]BFand a molecular weight of 146.89, belongs to the trigonal crystal system, has a space group of R3m; has lattice parameters of a=7.4634(10)Å, b=7.4634(10)Å, c=9.1216(19) (6)Å, and Z=3; has an ultraviolet cutoff edge of 200 nm; and has a frequency-multiplication response that is 4-5 times that of the commercialized nonlinear optical crystal KDP. A hydrothermal method, a room-temperature solution method, an evaporation method or a solvothermal method is used to grow the crystal in a centimeter-scaled size. The crystal can produce frequency-doubling, frequency-tripling, frequency-quadrupling, frequency-quintupling or frequency-sextupling harmonic light output from the fundamental frequency light of 1064 nm generated by a Nd:YAG laser, and/or can produce ultraviolet and deep-ultraviolet frequency-multiplication light output below 200 nm.

Nonlinear optical crystal of guanidinium tetrafluoroborate, preparation method and use thereof

A nonlinear optical crystal of barium cesium borate, a preparation method and use thereof are provided. The nonlinear optical crystal has a chemical formula of CsBaBOand a molecular weight of 983.84. The nonlinear optical crystal belongs to an orthorhombic crystal system; a space group of the nonlinear optical crystal is Cmc2; lattice parameters of the nonlinear optical crystal are a=19.011(7) Å, b=10.837(4) Å, c=8.578(3) Å, Z=4, V=1767.4(11) Å; and a Mohs hardness of the nonlinear optical crystal is 4-5. The nonlinear optical crystal is grown by a flux method. The nonlinear optical crystal of the barium cesium borate obtained is used for a manufacture of non-linear optical devices. The nonlinear optical crystal has a large size of centimeter-scale at least and is prepared by fast, simple and low-cost operations. The nonlinear optical crystal prepared has a large size, a wide light transmission band and good mechanical properties.

Nonlinear optical crystal of barium cesium borate, preparation method and use thereof

A laser fusion welding device includes a 1.9 μm laser light source, a control unit and a light spot adjusting device. The control unit is configured to control the laser light source and the light spot adjusting device to adjust a laser power density at an object to be subjected to fusion welding. The 1.9 μm laser light source has output power of 100-500 W. The control unit includes a time control unit, a power control unit and a light spot control unit. The time control unit is configured to control a turn-on time of the laser light source. The power control unit is configured to control the output power of the laser light source. The light spot control unit is configured to control the light spot adjusting device to adjust a size of a light spot at the object to be subjected to fusion welding.

Laser fusion welding device

A calcium metaborate birefringent crystal and a preparation method and use thereof, the crystal having a chemical formula of CaBOand a molecular weight of 125.70, and belonging to the orthorhombic crystal system and space group Pbcn with unit-cell parameters a=11.60(4)Å, b=4.28(8)Å, c=6.21(6)Å, and Z=4, wherein the calcium metaborate birefringent crystal is a negative biaxial crystal with a transmission range of 165-3400 nm and a birefringence between 0.09-0.36; the crystal is applicable to infrared-visible-ultraviolet-deep ultraviolet bands, and is grown by a melt method, a flux method, a Bridgman method or a heat exchange method; the crystal obtained by the method of the present invention is easy to grow and easy to process; and can be used for making polarizing beam-splitting prisms.

Calcium metaborate birefringent crystal, preparation method and use thereof

A method for measuring concentrations of multiple gases by using an infrared band laser light includes: pumping Ho crystal by using a 1.9 &#x3bc;m single thulium-doped solid-state laser to obtain a 2 &#x3bc;m band near-infrared laser output; controlling a light-emitting angle of 2 &#x3bc;m band laser light; allowing the 2 &#x3bc;m laser light to enter a first measurement cell at a first emergent angle, and measuring a concentration of methane gas in the first measurement cell; generating and introducing the 3-5 &#x3bc;m mid-infrared laser light into a second measurement cell to measure concentrations of ammonia gas and carbon monoxide in the second measurement cell; generating and introducing the 6-12 &#x3bc;m far-infrared laser light into a third measurement cell to measure concentrations of carbon dioxide, acetylene, ethylene and ethane gas in the third measurement cell.

Method for measuring concentrations of multiple gases by using infrared band laser light

A method for measuring multiple parameters of mixed gases based on broadband infrared light source is provided, including: filtering a broadband infrared laser, and forming a laser beam including three narrow-linewidth wavelengths; dividing the laser beam into a first sub-laser beam and a second sub-laser beam; focusing and transmitting the first sub-laser beam to a gas sample cell; focusing and transmitting the first sub-laser beam to a first reflector; reflecting and transmitting the first sub-laser beam; reflecting and transmitting the second sub-laser beam to the second beam splitter; combing the first sub-laser beam transmitted by the second beam splitter and the second sub-laser beam reflected by the second beam splitter, measuring the multiple parameters; combining and transmitting the second sub-laser beam transmitted by the second beam splitter and the first sub-laser beam reflected by the second beam splitter to a spectrometer for measuring concentrations the mixed gases.

Method for measuring multiple parameters of mixed gases based on broadband infrared light source

A fiber optic sensing head includes a single-mode optical fiber, a twin hole optical fiber including a cladding region and a core region surrounded by the cladding region, and the core region includes a second core located at an axis center, as well as a first and second round holes symmetrically distributed with respect to the second core; an incoming end of a gradient refractive-index fiber is connected to an outgoing end of the twin hole optical fiber with the incoming end of the gradient index fiber aligned with the outgoing end of the single-mode optical fiber at center. A thermal-sensitive structure is filled in a preset length part of the second round hole extending along an axial direction of the twin hole optical fiber. An incoming end of the twin hole optical fiber is connected to an outgoing end of the gradient index optical fiber with displacement.

Temperature sensor based on twin hole optical fiber

A compound strontium fluoroborate, nonlinear optical crystal of strontium fluoroborate, preparation method thereof; the chemical formula of the compound is SrB5O7F3, its molecular weight is 310.67, and it is prepared by solid-state reaction; the chemical formula of the crystal is SrB5O7F3, its molecular weight is 310.67, the crystal is of the orthorhombic series, the space group is Ccm21, and the crystal cell parameters are=10.016(6) &#x212b;, b=8.654(6)(4) &#x212b;, c=8.103(5) &#x212b;, Z=4, and V=702.4(8) &#x212b;3. A SrB5O7F3 nonlinear optical crystal has uses in the preparation of a harmonic light output when doubling, tripling, quadrupling, quintupling, or sextupling the frequency of a 1064-nm fundamental-frequency light outputted by a Nd:YAG laser, or the generation of a deep-ultraviolet frequency doubling light output lower than 200 nm, or in the preparation of a frequency multiplier, upper or lower frequency converter, or an optical parametric oscillator.

Compound strontium fluoroborate and strontium fluoroborate nonlinear optical crystal, and preparation methods and uses thereof

A compound ammonium fluoroborate, a nonlinear optical crystal of ammonium fluoroborate, and a preparation method and use thereof; the compound has the chemical formula of NHBOF with a molecular weight of 176.28, and is prepared by a solid phase reaction process; the crystal has the chemical formula of NHBOF with a molecular weight of 176.28, belongs to the orthorhombic system, and has a space group of Pna2and the following unit cell parameters: a=7.615(3) &#x212b;, b=11.207(4) &#x212b;, c=6.604(3) &#x212b;, Z=4, V=563.6 &#x212b;. The nonlinear optical crystal can be obtained by the method of the present invention. The present invention provides uses of the nonlinear optical crystal in producing harmonic light and a deep-ultraviolet frequency-multiplied light below 200 nm; and in making a frequency multiplication generator, a frequency up or down converter or an optical parametric oscillator.

Compound ammonium fluoroborate, nonlinear optical crystal of ammonium fluoroborate, and preparation method and use thereof

An oxychloride infrared nonlinear optical crystal and the preparation method and use thereof, the optical crystal has a general chemical formula of PbOCl, therein 0&#x3c;x&#x3c;0.139 or 0.141&#x3c;x&#x3c;0.159 or 0.161&#x3c;x&#x2264;0.6. The crystal is non-centrosymmetric, belongs to orthonormal system with space group of Fmm2, cell parameter is a=35.4963(14)&#xb1;0.05 &#x212b;, b=5.8320(2)&#xb1;0.05 &#x212b;, c=16.0912(6)&#xb1;0.05 &#x212b;. The crystal is prepared by high temperature melt method or flux method. The crystal has a strong second harmonic generation efficiency of 4 times that of KDP (KHPO) tested by Kurtz method, it is phase machable, transparent in the range of 0.34-7 &#x3bc;m. The laser damage threshold is 10 times that of the current commercial infrared nonlinear optical crystal AgGaS. No crystalline water exists in lead oxychloride, and it is stable in the air and has good thermal stability.

Lead oxychloride, infrared nonlinear optical crystal, and preparation method thereof

The invention relates to a lithium metaborate crystal and a preparation method and use thereof. The crystal has a chemical formula of LiBO, a molecular weight of 49.75, and is a member of the monoclinic crystal system. The crystal has a P2/c space group and lattice constants of a=5.85(8) &#x212b;, b=4.35(7) &#x212b;, c=6.46(6) &#x212b;, &#x3b2;=115(5)&#xb0;, and Z=4. The crystal can be applied in wavelengths of infrared-visible-deep ultraviolet, and is grown by utilizing a melt crystallization method or a flux method. The crystal obtained using the method described in the invention is easily grown and processed, and can be used in the manufacture of a polarizing beam splitting prism such as a Glan prism, a Wollaston prism, a Rochon prism or a beam-splitting polarizer, and other optical components, enabling crucial applications in the fields of optics and communication.

Lithium metaborate crystal, preparation method and use thereof

A nonlinear optical crystal of cesium fluorooxoborate, and a method of preparation and use thereof. The crystal has a chemical formula of CsBOF and a molecular weight of 291.15. It belongs to an orthorhombic crystal system, with a space group of Pna2, crystal cell parameters of a=7.9241 &#x212b;, b=11.3996 &#x212b;, c=6.6638 &#x212b;, and &#x3b1;=&#x3b2;=&#x3b3;=90&#xb0;, and a unit cell volume of 601.95 &#x212b;. A melt method, high temperature solution method, vacuum encapsulation method, hydrothermal method or room temperature solution method is used to grow the crystal of CsBOF.

Nonlinear optical crystal of cesium fluorooxoborate, and method of preparation and use thereof

A preparation method and application of a NaBa(BO)F birefringent crystal, the crystal having a chemical formula of NaBa(BO)F, and belonging to a hexagonal crystal system, the space group being P6/m, and the lattice parameters comprising a=7.3490(6) &#x212b;, c=12.6340(2) &#x212b;, V=590.93(12) &#x212b;, Z=2; the crystal is used for an infrared/deep ultraviolet waveband, and is an uniaxial negative crystal, n&#x3c;n, the transmission range being 175-3,350 nm, the birefringence of 0.090 (3,350 nm)-0.240 (175 nm), and the crystal being grown by employing a melting method or a flux method; the crystal prepared via the method has a short growth cycle, high crystal quality and large crystal size, is easy to grow, cut, polish and store, is stable in the air, and difficult to deliquesce, and can be used for preparation of various polarization beam polarization beam splitter prism and infrared/deep ultraviolet waveband optical communication elements.

Preparation method and application of sodium barium fluoroborate birefringent crystal

The present invention relates to a cesium borosilicate compound, a nonlinear optical crystal of cesium borosilicate, and a preparation method therefor and a use thereof. The cesium borosilicate compound has a chemical formula of CsBSiOand a molecular weight of 481.15, and is prepared using a solid phase method. The nonlinear optical crystal of the cesium borosilicate compound has a chemical formula of CsBSiOand a molecular weight of 481.15, does not have a center of symmetry, belongs to the tetragonal system with space group Iand unit-cell parameters a=6.731(3) &#x212b;, c=9.871(9) &#x212b; and V=447.2(5) &#x212b;, and has a wide transmittance range. The shortest ultraviolet cutoff edge is smaller than 190 nm, the frequency doubling effect of the crystal is 4.6 KDP, and the crystal is grown by a high-temperature solution spontaneous crystallization method and a flux method. The crystal has advantages of high growth rate, being transparent and inclusion free, low cost having a wide transmittance range, high hardness, good mechanical property, being crack resistant and not prone to deliquescence, being easy to process and store, and the like. The crystal is widely applied to manufacturing of nonlinear optical devices such as frequency doubling generators, frequency up-converters, frequency down-converters or optical parametric oscillators.

Cesium borosilicate compound, nonlinear optical crystal of cesium borosilicate, and preparation method therefor 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 BaBO, 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 P6and lattice parameters of a=6.7233(6) &#x212b;, c=18.776(4) &#x212b;, V=735.01(17) &#x212b;, and Z=6, wherein the powder frequency-doubled effect thereof is two times that of KDP (KHPO), 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.

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Urumqi, China

Shilie Pan