Abstract: A laser micro/nano processing system (100, 200, 300, 400) comprises: a laser light source used to provide a first laser beam having a first wavelength and a second laser beam having a second wavelength different from the first wavelength, with the pulse width of the first laser beam being in the range from a nanosecond to a femtosecond; an optical focusing assembly used to focus the first laser beam and the second laser beam to the same focal point; and a micro mobile platform (21) controlled by a computer. Also disclosed are a method for micro/nano-processing photosensitive materials with a laser and a method for fabricating a device with a micro/nano structure using laser two-photon direct writing technology. In the system and methods, spatial and temporal overlapping of two laser beams is utilized, so as to obtain a micro/nano structure with a processing resolution higher than that of a single laser beam, using an average power lower than that of a single laser beam.

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 borate birefringent crystal applicable to ultraviolet (UV) or deep ultraviolet (DUV) range, with chemical formula of Ba2Mg(B3O6)2. The borate birefringent crystal belongs to a trigonal system, with space group of R-3 wherein a=0.70528(3) nm, c=1.65520(9) nm and Z=12. The barium magnesium borate birefringent crystal is negative uniaxial (ne<no) with a birefringence of 0.077-0.229 and a transmission range of 177-3000 nm. The crystal is easy to cut, grind, polish, and preserve, and is stable in air and is not easy to deliquesce. The barium magnesium borate birefringent crystal can be grown by the Czochralski method, flux method or the method of spontaneous crystallization from a melt, and has larger birefringence (no?ne=0.077-0.229). The crystal has important applications in the fields of optics and communications, e.g. for fabricating the polarizing beam splitter prism.

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 laser micro/nano processing system (100, 200, 300, 400) comprises: a laser light source used to provide a first laser beam having a first wavelength and a second laser beam having a second wavelength different from the first wavelength, with the pulse width of the first laser beam being in the range from a nanosecond to a femtosecond; an optical focusing assembly used to focus the first laser beam and the second laser beam to the same focal point; and a micro mobile platform (21) controlled by a computer. Also disclosed are a method for micro/nano-processing photosensitive materials with a laser and a method for fabricating a device with a micro/nano structure using laser two-photon direct writing technology. In the system and methods, spatial and temporal overlapping of two laser beams is utilized, so as to obtain a micro/nano structure with a processing resolution higher than that of a single laser beam, using an average power lower than that of a single laser beam.

Abstract: Disclosed is a molecular glass of a spirofluorene derivative having a molecular structure as follows: formula (I), wherein each of R1-R12 is a hydrogen atom, a hydroxyl group, a methoxyl group or an acid-sensitive substituent; substituents R1˜R12 can be identical or different, but on the same benzene ring the substituents cannot all be hydrogen atoms. The molecular glass has a good solubility in various polar solvents, is suitable to be made into a film; meanwhile the molecular glass has a very high glass transition temperature and meets the requirements of the photolithography processing technology. Also disclosed is a preparation method of the above-mentioned molecular glass of a spirofluorene derivative. The synthetic process of the method is simple and suitable for industrialization.

Abstract: A laser micro/nano processing system (100, 200, 300, 400) comprises: a laser light source used to provide a first laser beam having a first wavelength and a second laser beam having a second wavelength different from the first wavelength, with the pulse width of the first laser beam being in the range from a nanosecond to a femtosecond; an optical focusing assembly used to focus the first laser beam and the second laser beam to the same focal point; and a micro mobile platform (21) controlled by a computer. Also disclosed are a method for micro/nano-processing photosensitive materials with a laser and a method for fabricating a device with a micro/nano structure using laser two-photon direct writing technology. In the system and methods, spatial and temporal overlapping of two laser beams is utilized, so as to obtain a micro/nano structure with a processing resolution higher than that of a single laser beam, using an average power lower than that of a single laser beam.

Abstract: Disclosed are a semiconductor photocatalyst for the photocatalytic reforming of biomass derivatives for hydrogen generation, and preparation and use thereof. The semiconductor photocatalyst has the atomic composition ratio of M˜N-Ax; wherein M˜N are IIB group elements to VIA group elements, or IIIA group elements to VA group elements, A being one element or more than two elements selected from the group consisting of cobalt, nickel, iron, copper, chromium, palladium, platinum, ruthenium, rhodium, iridium and silver; and 0.02%?x?1.0%. The method of in-situ preparation of the highly effective semiconductor photocatalyst and catalytically reforming biomass derivatives for hydrogen generation by driving photoreaction with visible light via quantum dots is simple, fast, highly effective, inexpensive and practical. The in situ reaction can occur in sunlight without the need of harsh conditions such as calcination.

Abstract: The invention discloses a polymer micro-needle array chip, comprising a substrate and a micro-needle array standing thereon; the material for preparing the micro-needle array is a polyacrylamides polymer, with the molecular weight of 1.0×104-2.0×105, the Vickers hardness of 150-600 HV, and the impact strength of 5-30 J/m. The polymer micro-needle array chip has a high mechanical strength and a sharp needle tip, and it can easily dissolve or swell on contact with a water-containing environment, which helps the drug to be released slowly in the skin.

Abstract: The present invention relates to a KBBF family nonlinear optical crystal-prism coupler and its method of fabrication. The coupler comprises: a KBBF family crystal with two smooth surfaces; transition layers each of which is deposited on respective one of the two smooth surfaces of the KBBF family crystal; and a pair of prisms each of which optically contacts with respective one of the activated transition layers. The present invention further provides a KBBF family nonlinear optical crystal-prism coupler that comprises: a KBBF family crystal with two smooth surfaces; a pair of prisms each of which has a smooth surfaces; first transition layers each of which is deposited on respective one of the two smooth surfaces of the KBBF family crystal; and second transition layers each of which is deposited on a smooth surface of respective one of the pair of prisms, wherein the first and second transition layers are integral by optical contact.

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: Disclosed are a semiconductor photocatalyst for the photocatalytic reforming of biomass derivatives for hydrogen generation, and preparation and use thereof. The semiconductor photocatalyst has the atomic composition ratio of M˜N-Ax; wherein M˜N are IIB group elements to VIA group elements, or IIIA group elements to VA group elements, A being one element or more than two elements selected from the group consisting of cobalt, nickel, iron, copper, chromium, palladium, platinum, ruthenium, rhodium, iridium and silver; and 0.02%?x?1.0%. The method of in-situ preparation of the highly effective semiconductor photocatalyst and catalytically reforming biomass derivatives for hydrogen generation by driving photoreaction with visible light via quantum dots is simple, fast, highly effective, inexpensive and practical. The in situ reaction can occur in sunlight without the need of harsh conditions such as calcination.

Abstract: A laser micro/nano processing system (100, 200, 300, 400) comprises: a laser light source used to provide a first laser beam having a first wavelength and a second laser beam having a second wavelength different from the first wavelength, with the pulse width of the first laser beam being in the range from a nanosecond to a femtosecond; an optical focusing assembly used to focus the first laser beam and the second laser beam to the same focal point; and a micro mobile platform (21) controlled by a computer. Also disclosed are a method for micro/nano-processing photosensitive materials with a laser and a method for fabricating a device with a micro/nano structure using laser two-photon direct writing technology. In the system and methods, spatial and temporal overlapping of two laser beams is utilized, so as to obtain a micro/nano structure with a processing resolution higher than that of a single laser beam, using an average power lower than that of a single laser beam.

Abstract: The present invention relates to a large-sized and high-quality bismuth-zinc-borate (Bi.sub.2 ZnB.sub.2 O.sub.7) single crystal, preparation methods and applications thereof. The crystal has cross-sectional dimensions greater than one centimeter, a nonlinear optical effect of about 3-4 times that of KH.sub.2 PO.sub.4 (KDP), and an optical transmission wavelength range of 330-3300 nm. The crystal can be grown from a compound melt by a Czochralski method, a Kyropoulos method or a Bridgman method with the raw material being the synthetic compound Bi.sub.2 ZnB.sub.2 O.sub.7. Alternatively, the crystal may be grown from a high-temperature solution method by using Bi.sub.2 O.sub.3 as a flux. The crystal may be applied in nonlinear optical devices such as frequency doubling generators, frequency upconverters or downconverters, and optical parametric oscillators.

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: The present invention relates to an electrospinning device for fabricating a membrane, in particular, to an electrospinning device for fabricating membrane by using spinnerets aligned in machine direction (MD) and transverse direction (TD) in a high-voltage DC electric field, and to method for using the same. In addition to producing a single-layer nanofiber membrane from a polymer composite, the electrospinning device according to the present invention can also conveniently produce a multilayer composite nanofiber membrane from more than one polymer composites. The electrospinning device comprises a control section, an electrospinning section and an ancillary section. The electrospinning section comprises a MD spinnerets set and a TD spinnerets set that are alternately arranged and moves above a membrane collecting device in a to-and-fro scanning manner so as to improve the evenness and strength of the obtained membrane.

Abstract: Disclosed herein are several organic compounds having electron-transporting and/or hole-blocking performance and their preparation method and use and the OLEDs comprising the organic compound. The organic compounds exhibit high ionization potential (IP), electron affinity (Ea), glass transition temperature (Tg) and high electron mobility, and are a kind of good electron-transporting material with good hole-blocking ability. The devices comprising these compounds as one of the emitting layer, electron-transporting layer (ETL) and hole-blocking layer (HBL) show improved efficiency and better color purity.

Abstract: A fluoroberyllium borate non-linear optical single crystal is represented by a molecular formula of MBe2BO3F2, wherein M is Rb or Cs. The crystal can be grown by the flux method comprising the steps of mixing a fluoroberyllium borate compound and a flux in proportion, heating the mixture up to 750-800° C., keeping at this temperature and then cooling it to the temperature of 2-10° C. above the saturating point to obtain a fluoroberyllium borate solution at high temperature; putting the seed crystal fixed on the end of a crystal hanging bar into the fluoroberyllium borate solution at high temperature, rotating the crystal hanging bar, cooling the melt solution to its saturating point, then cooling it again slowly, pulling the obtained crystal out of the solution surface, cooling it to room temperature, then obtaining the present fluoroberyllium borate non-linear optical crystal.

Abstract: A fluoroberyllium borate non-linear optical single crystal is represented by a molecular formula of MBe2BO3F2, wherein M is Rb or Cs. The crystal can be grown by the flux method comprising the steps of mixing a fluoroberyllium borate compound and a flux in proportion, heating the mixture up to 750-800° C., keeping at this temperature and then cooling it to the temperature of 2-10° C. above the saturating point to obtain a fluoroberyllium borate solution at high temperature; putting the seed crystal fixed on the end of a crystal hanging bar into the fluoroberyllium borate solution at high temperature, rotating the crystal hanging bar, cooling the melt solution to its saturating point, then cooling it again slowly, pulling the obtained crystal out of the solution surface, cooling it to room temperature, then obtaining the present fluoroberyllium borate non-linear optical crystal.