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 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 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: The present invention relates to a potassium chloroborate nonlinear optical crystal, a preparation method and a use thereof. The crystal has a chemical formula of K3B6O10Cl, has no symmetric center, belongs to rhombohedral crystal system, has a space group R3m with unit cell parameters of a=10.0624(14) ?, b=10.0624(14) ?, c=8.8361(18) ?, Z=3 and V=774.8(2) ?3. It has a powder second harmonic generation efficiency of about 3 times that of KDP (KH2PO4), and a Mohs hardness of 4-5, a transparent wavelength range of 165 nm-3460 nm. The compound is synthesized by a solid-state reaction and the crystal is grown by using a flux, which are of easy operation and low costs. The obtained crystal has large size, short growing period, little inclusion, relatively high mechanical hardness, and is easy to be cut, polished and stored. Said crystal is used to generate a second, third, fourth or fifth harmonic light output for a laser beam with a wavelength of 1064 nm.

Abstract: The present invention provides a barium fluoroborate compound, a nonlinear optical crystal and the preparation method and use thereof. Both of the barium fluoroborate compound and the nonlinear optical crystal have a chemical formula of Ba4B11O20F. The crystal belongs to orthorhombic crystal system, has a space group Cmc21 with unit cell parameters of a=18.802(3) ?, b=10.7143(19) ?, c=8.6113(14) ?, V=1734.7(5) ?3. The crystal has a powder second harmonic generation efficiency of 10 times that of KDP (KH2PO4). The ultraviolet cutoff wavelength is about 170 nm. The barium fluoroborate compound is prepared by a solid-state reaction. The barium fluoroborate nonlinear optical crystal prepared by a high temperature melting liquid method has large hardness and is easy to be cut, polished and stored. This crystal can be used widely in preparing the nonlinear optical devices of the second harmonic generator, the up frequency converter, the down frequency converter or the optical parametric oscillator or the like.

Abstract: Rupestonic acid derivatives are rupestonic acid derivative A- or B-type compounds, prepared through a condensation reaction from starting materials, i.e., a monomer compound of rupestonic acid and an aromatic amine or fatty amine or an organic alcohol, i.e., a fatty alcohol or an aromatic alcohol. Rupestonic acid, which is the monomer compound of sesquiterpene isolated from the plant Xinjiang Artemisia rupestric L., is used as a mother compound. Natural anti-virus lead compound with high activity are discovered by modifying the structure of the monomer compound of rupestonic acid. Activity results of the lead compound showed pharmaceutical application of anti-I, II flu virus and anti-I, II herpes simplex virus infection. These compounds can be used alone or in combination with one or more pharmaceutical acceptable, inert and nontoxic excipients or carries in a pharmaceutical composition.