光折变晶体前向两波耦合通用公式

General formulae of codirectional two-beam Coupling in photorefractive material

本文导出了光折变材料前向两波耦合强度和相位以热激发速率同光电离截面比值为变量的通用公式。而以前广泛使用的公式是它的一个特例。当热激发速率与光电离率可比拟时 ,通用公式能给出更准确的描述。对于一些问题用这些公式是必须的 。

The general intensity and phase formulae with the ratio of thermal emission rate to photoinization cross section as their explicit varable for codirectional two -beam coupling in photorefractive material is presented, The previous formulae to have been used widely only are their special case.When thermal emission rate is comparable with photoexcitation rate,the general formulae can give a more accurate description.It is necessary for some problems to using the formulae,such as temperature dependence of two -Wave coupling.