The optical pulsation phenomenon which occurs in two-beam coupling and four-wave mixing in photorefractive LiNbO_3:Fe crystal is reported. This phenomenon is considered to originate from the trap-recharging wave in LiNbO_3:Fe crystal, which induces a moving phase grating in the photorefractive material.
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武原庆 许京军.光折变的光学脉动现象及其非线性过程[J].红外与毫米波学报,1991,10(1):11~16]. WU YUANQING, XU JINJUN, LIU SIMIN, ZHANG GUANGYIN. OPTICAL PULSATION AND ITS NONLINEAR PROCESS IN PHOTOREFRACTIVE MATERIAL[J]. J. Infrared Millim. Waves,1991,10(1):11~16.]