In this paper, photorefractive crystals of Cu-doped (K0.5Na0.5)0.2 (Sr0.75Ba0.25)0.9Nb2O6 (KNSBN) are systematically studied. A series of Cu-doped KNSBN crystals have been grown and the samples with Cu-dopant in diffe...In this paper, photorefractive crystals of Cu-doped (K0.5Na0.5)0.2 (Sr0.75Ba0.25)0.9Nb2O6 (KNSBN) are systematically studied. A series of Cu-doped KNSBN crystals have been grown and the samples with Cu-dopant in different levels and thicknesses have been fabricated. Their photorefractive properties including two-wave coupling gain coefficients and response rate are experimentally studied in details. The results show that (1) with high Cudopant cocentration, the crystal has larger coupling gain coefficient, higher effective charge carrier density, and faster time response; (2) thinner sample shows larger coupling gain coefficientl (3) at shorter wavelength 9 the crystal sample shows larger coupling gain coefficient and faster time response. The Cu-doping mechanisms were briefly referred. The analyses of the relationships among the crystal’s two-wave coupling, absorption property and the self-pumped phase conjugation are given. All the results show that Cu-doped KNSBN crystals are a kind of very promising photorefractive materials.展开更多
Self-pumped phase conjugation （SPPC） is completely self-contained and requires no external mirrors, pumping beams or applied electric fields. Because of its simplicity and high reflectivity, SPPC has a host of poten...Self-pumped phase conjugation （SPPC） is completely self-contained and requires no external mirrors, pumping beams or applied electric fields. Because of its simplicity and high reflectivity, SPPC has a host of potential applications including correcting spatial phase distortion, and optical image processing. At the present time, SPPC has been realized in BaTiO<sub>3</sub>, KNbO<sub>3</sub>, Ce-doped SBN and KNSBN single crystals. The KNSBN展开更多
Potassium sodium strontium barium niobate (KNSBN) crystal is one of the important photorefractive ferroelectric crystal materials, not only having good photorefractive properties, but also many advantages over other p...Potassium sodium strontium barium niobate (KNSBN) crystal is one of the important photorefractive ferroelectric crystal materials, not only having good photorefractive properties, but also many advantages over other photorefractive crystal materials: (ⅰ) it is easy to grow in large size, (ⅱ) neither twinning nor poling problems exist; (ⅲ) it can accommodate a wide range of solution; (ⅳ) it is easy to be doped with many kinds of dopants.展开更多
文摘In this paper, photorefractive crystals of Cu-doped (K0.5Na0.5)0.2 (Sr0.75Ba0.25)0.9Nb2O6 (KNSBN) are systematically studied. A series of Cu-doped KNSBN crystals have been grown and the samples with Cu-dopant in different levels and thicknesses have been fabricated. Their photorefractive properties including two-wave coupling gain coefficients and response rate are experimentally studied in details. The results show that (1) with high Cudopant cocentration, the crystal has larger coupling gain coefficient, higher effective charge carrier density, and faster time response; (2) thinner sample shows larger coupling gain coefficientl (3) at shorter wavelength 9 the crystal sample shows larger coupling gain coefficient and faster time response. The Cu-doping mechanisms were briefly referred. The analyses of the relationships among the crystal’s two-wave coupling, absorption property and the self-pumped phase conjugation are given. All the results show that Cu-doped KNSBN crystals are a kind of very promising photorefractive materials.
文摘Self-pumped phase conjugation （SPPC） is completely self-contained and requires no external mirrors, pumping beams or applied electric fields. Because of its simplicity and high reflectivity, SPPC has a host of potential applications including correcting spatial phase distortion, and optical image processing. At the present time, SPPC has been realized in BaTiO<sub>3</sub>, KNbO<sub>3</sub>, Ce-doped SBN and KNSBN single crystals. The KNSBN
基金Project supported by the National Natural Science Foundation of China
文摘Potassium sodium strontium barium niobate (KNSBN) crystal is one of the important photorefractive ferroelectric crystal materials, not only having good photorefractive properties, but also many advantages over other photorefractive crystal materials: (ⅰ) it is easy to grow in large size, (ⅱ) neither twinning nor poling problems exist; (ⅲ) it can accommodate a wide range of solution; (ⅳ) it is easy to be doped with many kinds of dopants.
