高阶空间电荷场对匹配高斯光束自偏转特性的影响

通过数值模拟的方法，研究了高阶空间电荷场对匹配高斯光束在光伏光折变晶体中自偏转特性的影响。结果表明，对于给定的与晶体参量匹配的高斯光束，高阶空间电荷场对其自偏转特性的影响与外电场和光伏场的极性和强度，以及入射光束的强度有关。当外电场、光伏场、入射光束的强度取不同的参数组合时，就可以控制高斯光束的偏转程度，在三者特定的参数组合下，还可以实现高斯光束偏转方向的改变，进而实现高斯光束的无偏转稳定传播。

Higher-order space-charge field effects on the self-deflection of matching Gauss beam

Higher-order space-charge field effect on the self-deflection of a Gaussian beam is numerically investigated. The resulted obtained indicates that, for a given photovoltaic-photorefractive crystal and a Gaussian beam which matches with its parameters, the effects of the higher-order space-charge field on self-deflection of Gauss beam is depend on the polarity and strength of the two field, extra electric field and photovoltaic field, and on the incident optical intensity. When the extra electric field and photovoltaic field and incident optical intensity have different combination, and obtained different self-deflection, respectively. At an especially combination, obtained the change of deflection direction of Gauss beam, and that obtained stability transmit of Gauss beam without deflection.