Chinese Academy of Sciences

Fangfang Zhang

Shilie Pan

Xueling Hou

Xinglong Chen

Yu Chen Zhou

Ying Chu Wang

Linjun Li

Yingjie Shen

Xin He

Qianqian Hao

Xiaoming Duan

Yuqiang Yang

Guoqiang Shi

Xuefei Wang

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 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

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

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Urumqi, China

Fangfang Zhang