采用非同时读出条件下晶体两波耦合实验装置,以单束光入射Ce:KNSBN光折变晶体,通过改变抽运光偏振方向和晶体c轴的夹角φ,系统记录了不同φ角下的抽运光透射光强I′p随时间的变化情况。实验结果表明,当φ≤30°时,基本没有光扇效应;实验研究了正交偏振光写入下Ce:KNSBN晶体的两波耦合动态过程,并与e光写入下两波耦合动态过程进行了比较,发现正交偏振光写入时光扇噪声得到了明显抑制,在相同的写入参量条件下光栅的衍射效率明显提高。 Using a two-wave crystal coupled experimental apparatus under non-simultaneous readout conditions, Ce: KNSBN photorefractive crystal is incident on a single beam. By changing the included angle between the polarization direction of the pump light and the c-axis of the crystal, Of the pump light transmission intensity I’p with time changes. Experimental results show that there is no optical fan effect whenφ≤30 °. The two-wave coupling dynamic process of Ce: KNSBN crystal under orthorhombic polarization is experimentally studied, and the two-wave coupling dynamic process It is found that the optical fan noise is obviously suppressed when the orthogonal polarization is written, and the diffraction efficiency of the grating is obviously improved under the same write parameters.