GaAs中EL2能级参与的ps光折变效应中空间电荷场的退化

Decay of space-charge field in ps photorefractive effect in which EL2 level associate in GaAs

采用光学简并四波混频方法,测量了共轭信号强度随延迟时间改变的变化曲线,实验发现,其中存在一个快变与一个慢变信号,经分析表明,空间电荷场的退化很慢,它能维持到ns的量级。

The intensity of phase conjugation signal versus time decay has been measured using optical DFWM method. It has been found that there are a faster decay signal and a lower one. It showes that the decay of space-charge field is very slow and it can persist for a time of ns scale.