A new borophosphate compound Cd3 BPO7（Mr = 490.98） has been successfully synthesized by conventional high temperature solid state reaction for the first time and its structure was determined by single-crystal X-ray ...A new borophosphate compound Cd3 BPO7（Mr = 490.98） has been successfully synthesized by conventional high temperature solid state reaction for the first time and its structure was determined by single-crystal X-ray diffraction. It crystallizes in orthorhombic, space group Pna21, with a = 13.247（3）, b = 8.8217（18）, c = 5.0792（10）, V = 593.56（20）3, Z = 4, Dc = 5.494 g/cm3, λ（CuKα） = 1.5406, F（000） = 880, the final R = 0.0212 and wR = 0.0513 for 1287 observed reflections（I 〉 2σ（I））. In the crystal structure of Cd3 BPO7, the Cd（II） forms a slightly distorted octahedral geometry, BO3 3- and PO4 3- ions linking adjacent Cd（II） ions to form a 3D network. The second harmonic generation（SHG） on powder samples was measured using Kurtz and Perry technique. The result indicates that Cd3 BPO7 exhibits a SHG response 2.2 times larger than that of potassium dihydrogen phosphate（KDP） and is phase-matchable.展开更多
With the pulsed laser deposition （PLD） method, amorphous 80GeS2-15Ga2S3-5CdS chalcogenide film was deposited on glassy substrate. Obvious second harmonic generation （SHG） was observed in the ultraviolet （UV）-pol...With the pulsed laser deposition （PLD） method, amorphous 80GeS2-15Ga2S3-5CdS chalcogenide film was deposited on glassy substrate. Obvious second harmonic generation （SHG） was observed in the ultraviolet （UV）-polarized film and the SHG intensity increased with the increase in single pulse energy and irradiation time. Through Raman spectra and transmission spectra, the mechanism of SHG was studied. The experimental results demonstrated that effective electron traps and hole traps were generated in the UV- polarized film. The energy of electrons and holes was using up due to the collision with other particles and crystal fields during their movement and finally they were captured by the traps and fixed, which made the electric charge distribution nonuniform in the film and destroyed the spatial isotropy. In the meantime, the center of positive and negative charges separated and a built-in electric field was formed which generated the optical second-order nonlinearity of the film.展开更多
文摘A new borophosphate compound Cd3 BPO7（Mr = 490.98） has been successfully synthesized by conventional high temperature solid state reaction for the first time and its structure was determined by single-crystal X-ray diffraction. It crystallizes in orthorhombic, space group Pna21, with a = 13.247（3）, b = 8.8217（18）, c = 5.0792（10）, V = 593.56（20）3, Z = 4, Dc = 5.494 g/cm3, λ（CuKα） = 1.5406, F（000） = 880, the final R = 0.0212 and wR = 0.0513 for 1287 observed reflections（I 〉 2σ（I））. In the crystal structure of Cd3 BPO7, the Cd（II） forms a slightly distorted octahedral geometry, BO3 3- and PO4 3- ions linking adjacent Cd（II） ions to form a 3D network. The second harmonic generation（SHG） on powder samples was measured using Kurtz and Perry technique. The result indicates that Cd3 BPO7 exhibits a SHG response 2.2 times larger than that of potassium dihydrogen phosphate（KDP） and is phase-matchable.
基金Funded by the National Natural Science Foundaition of China(Nos.51172169 and 61177084),NCET\(NCET-11-0687)the Fundamental Research Funds for the Central Universities(Wuhan University of Technology)
文摘With the pulsed laser deposition （PLD） method, amorphous 80GeS2-15Ga2S3-5CdS chalcogenide film was deposited on glassy substrate. Obvious second harmonic generation （SHG） was observed in the ultraviolet （UV）-polarized film and the SHG intensity increased with the increase in single pulse energy and irradiation time. Through Raman spectra and transmission spectra, the mechanism of SHG was studied. The experimental results demonstrated that effective electron traps and hole traps were generated in the UV- polarized film. The energy of electrons and holes was using up due to the collision with other particles and crystal fields during their movement and finally they were captured by the traps and fixed, which made the electric charge distribution nonuniform in the film and destroyed the spatial isotropy. In the meantime, the center of positive and negative charges separated and a built-in electric field was formed which generated the optical second-order nonlinearity of the film.
