有偏压的光伏光折变晶体中屏蔽光伏孤子的自偏转

修正了有偏压的光伏光折变晶体中屏蔽光伏孤子的理论。用微扰法研究了屏蔽光伏孤子的自偏转，得出孤子光呸中心的运动为抛物线，并且空间频率分量随传播距离而线性移动，改变外偏压或旋转光的偏振方向可以控制其自偏转。当光伏效应可忽略时，屏蔽光伏孤子的非线性波动方程就转化为屏蔽孤子的非线性波动方程，它的自偏转就转化为屏蔽孤子的自偏转。当外偏压为零时，屏蔽光伏孤子的非线性波动方程就转化为光伏孤子的非线性波动方程，它的自偏转证明了光伏孤子中也存在着自偏转。

Self Deflection of Steady State Spatial Solitons in Biased Photorefractive Photovoltaic Crystals

A theory of screening-photovoltaic solitons is improved in biased photorefractive-photovoltaic crystals. The self-deflection of screening-photovoltaic solitons arising from diffusion effects is investigated using perturbation analysis. It is concluded that are the center of the optical beam moves on a parabolic trajectory and the central spatial frequency component shifts linearly with the propagation distance. The self-deflection of screening-photovoltaic solitons can be controlled by changing the external voltage or by rotating the polarization of the light. When photovoltaic effect is neglectable, the nonlinear wave equation of screening-photovoltaic solitons is the nonlinear wave equation of screening solitons, and their self-deflection is the self-deflection of screening solitons. When the external electric field is absent, the nonlinear wave equation of screening-photovoltaic solitons is the nonlinear wave equation of photovoltaic solitons in the closed and the open circuit, and their self-deflection predict that photovoltaic solitons is of the self-deflection.