Abstract: 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) ?, b=8.654(6)(4) ?, c=8.103(5) ?, Z=4, and V=702.4(8) ?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.

Abstract: A laser display system includes a red light semiconductor laser module (1), a green light semiconductor laser module (2), a blue light semiconductor laser module (3), a decoherence device (7, 8, 9), light valves (12, 13, 14), collimating and shaping devices (4, 5, 6), a heat dissipating modules (16-1, 16-2, 16-3), a temperature control module (17) and a semiconductor laser control module (18). The wavelength range output by the red light semiconductor laser module (1) is from 635 nm to 670 nm; the wavelength range output by the green light semiconductor laser module (2) is from 515 nm to 530 nm; the wavelength range output by the blue light semiconductor laser module (3) is from 440 nm to 460 nm.

Abstract: A calcium metaborate birefringent crystal and a preparation method and use thereof, the crystal having a chemical formula of CaB2O4 and 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)?, b=4.28(8)?, c=6.21(6)?, 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.

Abstract: The cryogenic liquid medium provided by the present invention includes at least one of an alkane composition, an olefin composition, an alcohol composition and an ether composition, and each of the alkane composition, the olefin composition, the alcohol combination and the ether composition includes a corresponding non-toxic and harmless substance having a melting point lower than ?110° C. and a standard boiling point higher than 50° C. Since the cryogenic liquid medium is formed by the non-toxic and harmless single substance having the melting point lower than ?110° C. and the standard boiling point higher than 50° C. or a binary, ternary and multi-component mixture thereof, the cryogenic liquid medium has a lower atmospheric boiling point, and is difficult to volatilize. The eutectic crystal of the specific mixture can be used to achieve the liquid requirements of low temperature, especially the temperature below ?110° C.

Abstract: Disclosed is a novel water-soluble natural polysaccharide antibacterial material. The molecules of the novel water-soluble natural polysaccharide antibacterial material not only contain guanidyl, but also contain amino acid groups, so that the biosafety of material is taken into consideration while the antibacterial performance of chitosan is improved, and the novel water-soluble natural polysaccharide antibacterial material has a low cytotoxicity and is a green antibacterial product.

Abstract: 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 NH4B4O6F with a molecular weight of 176.28, and is prepared by a solid phase reaction process; the crystal has the chemical formula of NH4B4O6F with a molecular weight of 176.28, belongs to the orthorhombic system, and has a space group of Pna21 and the following unit cell parameters: a=7.615(3) ?, b=11.207(4) ?, c=6.604(3) ?, Z=4, V=563.6 ?3. 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.

Abstract: 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 NH4B4O6F with a molecular weight of 176.28, and is prepared by a solid phase reaction process; the crystal has the chemical formula of NH4B4O6F with a molecular weight of 176.28, belongs to the orthorhombic system, and has a space group of Pna21 and the following unit cell parameters: a=7.615(3) ?, b=11.207(4) ?, c=6.604(3) ?, Z=4, V=563.6 ?3. 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.

Abstract: An oxychloride infrared nonlinear optical crystal and the preparation method and use thereof, the optical crystal has a general chemical formula of Pb2+xOCl2+2x, therein 0<x<0.139 or 0.141<x<0.159 or 0.161<x?0.6. The crystal is non-centrosymmetric, belongs to orthonormal system with space group of Fmm2, cell parameter is a=35.4963(14)±0.05 ?, b=5.8320(2)±0.05 ?, c=16.0912(6)±0.05 ?. 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 (KH2PO4) tested by Kurtz method, it is phase machable, transparent in the range of 0.34-7 ?m. The laser damage threshold is 10 times that of the current commercial infrared nonlinear optical crystal AgGaS2. No crystalline water exists in lead oxychloride, and it is stable in the air and has good thermal stability.

Abstract: The invention relates to a lithium metaborate crystal and a preparation method and use thereof. The crystal has a chemical formula of LiBO2, a molecular weight of 49.75, and is a member of the monoclinic crystal system. The crystal has a P21/c space group and lattice constants of a=5.85(8) ?, b=4.35(7) ?, c=6.46(6) ?, ?=115(5)°, 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.

Abstract: A nonlinear optical crystal of cesium fluorooxoborate, and a method of preparation and use thereof. The crystal has a chemical formula of CsB4O6F and a molecular weight of 291.15. It belongs to an orthorhombic crystal system, with a space group of Pna21, crystal cell parameters of a=7.9241 ?, b=11.3996 ?, c=6.6638 ?, and ?=?=?=90°, and a unit cell volume of 601.95 ?3. A melt method, high temperature solution method, vacuum encapsulation method, hydrothermal method or room temperature solution method is used to grow the crystal of CsB4O6F.

Abstract: A preparation method and application of a Na3Ba2(B3O6)2F birefringent crystal, the crystal having a chemical formula of Na3Ba2(B3O6)2F, and belonging to a hexagonal crystal system, the space group being P63/m, and the lattice parameters comprising a=7.3490(6) ?, c=12.6340(2) ?, V=590.93(12) ?3, Z=2; the crystal is used for an infrared/deep ultraviolet waveband, and is an uniaxial negative crystal, ne<no, 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.

Abstract: The invention relates to a lithium metaborate crystal and a preparation method and use thereof. The crystal has a chemical formula of LiBO2, a molecular weight of 49.75, and is a member of the monoclinic crystal system. The crystal has a P21/c space group and lattice constants of a=5.85(8) ?, b=4.35(7) ?, c=6.46(6) ?, ?=115(5) I°, 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.

Abstract: A method of preparing collagen active peptides with antiproliferative activity against cancer cells. The collagen active peptides are obtained by hydrolysis of papain and trypsin and a specific purifying process. The collagen active peptides have antiproliferative activity against cancer cells, such as ovarian carcinoma cells including SKOV3, OVCAR3, 436 and SRO82 and the prostate cancer cells including PC3, LnCAPC1, and LnCAPC2.

Abstract: A maskless photolithoghrapic system includes a laser point-by-point scanning exposure unit, a plane-projection exposure unit, a mobile station and a calculation control unit that decomposes a pattern to be exposed, so that a pattern portion with a precision requirement below a pre-determined threshold is exposed by the laser point-by-point scanning exposure unit, and a pattern portion with a precision requirement greater than the pre-determined threshold is exposed by the plane-projection exposure unit; when conducting laser point-by-point scanning exposure on a sample on the mobile station, the light emitted by the laser point-by-point scanning exposure unit moves relative to the sample according to the pattern portion with a precision requirement below the pre-determined threshold; and when conducting plane-projection exposure on the sample, the plane-projection exposure unit emits light with a corresponding pattern shape onto the sample according to the graph with a precision requirement greater than the p

Abstract: A compound of cesium fluorooxoborate, a nonlinear optical crystal of cesium fluorooxoborate, and a method of preparation and use thereof. The compound has a chemical formula of CsB4O6F and a molecular weight of 291.15. It has a crystal structure, which is prepared by a solid-state synthesis method or a vacuum encapsulation method. The crystal has a chemical formula of CsB4O6F and a molecular weight of 291.15. It belongs to an orthorhombic crystal system, with a space group of Pna21, crystal cell parameters of a=7.9241 ?, b=11.3996 ?, c=6.6638 ?, and ?=?=?=90°, and a unit cell volume of 601.95 ?3. A melt method, high temperature solution method, vacuum encapsulation method, hydrothermal method or room temperature solution method is used to grow the crystal of CsB4O6F.

Abstract: An oxychloride infrared nonlinear optical crystal and the preparation method and use thereof, the optical crystal has a general chemical formula of Pb2+xOCl2+2x, therein 0<x<0.139 or 0.141<x<0.159 or 0.161<x?0.6. The crystal is non-centrosymmetric, belongs to orthonormal system with space group of Fmm2, cell parameter is a=35.4963(14)±0.05 ?, b=5.8320(2)±0.05 ?, c=16.0912(6)±0.05 ?. 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 (KH2PO4) tested by Kurtz method, it is phase machable, transparent in the range of 0.34-7 ?m. The laser damage threshold is 10 times that of the current commercial infrared nonlinear optical crystal AgGaS2. No crystalline water exists in lead oxychloride, and it is stable in the air and has good thermal stability.

Abstract: A potassium fluoroboratoberyllate crystal oblique-incidence laser frequency multiplier, comprising: a flake-like potassium fluoroboratoberyllate crystal having parallel front and back polished surfaces; a front antireflection film and a back antireflection film; a columnar crystal support provided with a square holding slot and a light through-hole; and external heating jackets; the crystal is disposed in the square holding slot, the front and back surfaces of the crystal conforming to a main surface of the square holding slot, a normal of the main surface of the holding slot forming an angle ? with the central axis of the crystal support; a laser at a fundamental frequency passes through the front antireflection film, and a frequency-multiplied laser generated in the crystal is transmitted out through the back antireflection film. The present invention has a simple structure and a low cost, and is suitable for medium- and high-power laser systems.

Abstract: A method for preparing stably dispersed cellulose nanofibers comprises the following steps: 1) mixing cellulose and an organic solvent, the percentage of the cellulose being 1% to 15% in weight; 2) adding an esterification agent into the resultant mixture of step 1), the molar ratio of the esterification agent to the cellulose being from 1:0.1 to 4; and 3) physically breaking the resultant mixture of step 2) until a suspension liquid with stably dispersed cellulose nanofibers of 2-1000 nm in diameter and 10-100 ?m in length is obtained, an esterification reaction of hydroxyl group(s) on the surface of cellulose fibers occurring at the time of the breaking. Also disclosed are dispersed cellulose nanofibers with improved compatibility to the matrix than the untreated cellulose and an improved strength of the composite materials.

Abstract: 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) ?, c=18.776(4) ?, V=735.01(17) ?3, 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.

Abstract: A potassium fluoroboratoberyllate crystal oblique-incidence laser frequency multiplier, comprising: a flake-like potassium fluoroboratoberyllate crystal having parallel front and back polished surfaces; a front antireflection film and a back antireflection film; a columnar crystal support provided with a square holding slot and a light through-hole; and external heating jackets; the crystal is disposed in the square holding slot, the front and back surfaces of the crystal conforming to a main surface of the square holding slot, a normal of the main surface of the holding slot forming an angle ? with the central axis of the crystal support; a laser at a fundamental frequency passes through the front antireflection film, and a frequency-multiplied laser generated in the crystal is transmitted out through the back antireflection film. The present invention has a simple structure and a low cost, and is suitable for medium-and high-power laser systems.