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
This paper reports systematically the crystal growth and photorefractive properties of Cu-doped KNSBN, and the mechanism of the Cu ions’ effects on the photorefractive properties of KNSBN. The Cu ions doped in KNSBN ...This paper reports systematically the crystal growth and photorefractive properties of Cu-doped KNSBN, and the mechanism of the Cu ions’ effects on the photorefractive properties of KNSBN. The Cu ions doped in KNSBN can form two energy levels in the band gap, thus play important roles in the photorefractive process. They increase the effective electron combination center concentration, which results in the modification of the photorefractive properties of KNSBN. The two-wave coupling gain coefficient of KNSBN: Cu is two times greater than that of KNSBN. The photorefractive sensitivity of Cudoped KNSBN is estimated to be in the order of 10<sup>-3</sup> cm<sup>2</sup>/J. Its cat-SPPC reflectivity can reach 65％ corresponding to an response time less than 8 s.展开更多
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.
文摘This paper reports systematically the crystal growth and photorefractive properties of Cu-doped KNSBN, and the mechanism of the Cu ions’ effects on the photorefractive properties of KNSBN. The Cu ions doped in KNSBN can form two energy levels in the band gap, thus play important roles in the photorefractive process. They increase the effective electron combination center concentration, which results in the modification of the photorefractive properties of KNSBN. The two-wave coupling gain coefficient of KNSBN: Cu is two times greater than that of KNSBN. The photorefractive sensitivity of Cudoped KNSBN is estimated to be in the order of 10<sup>-3</sup> cm<sup>2</sup>/J. Its cat-SPPC reflectivity can reach 65％ corresponding to an response time less than 8 s.
