在局域非线性响应的光折变晶体中的对称光扇

SYMMETRIC BEAM FANNING IN PHOTOREFRACTIVE CRYSTALS WITH A LOCAL NONLINEAR RESPONSE

在具有非局域非线性响应的所有光折变晶体中几乎都能观察到光折变光扇效应．最近我们在具有局域非线性响应的光折变晶体（ＬｉＮｂＯ３∶Ｆｅ）观察到对称光扇．基于前向简并三波作用。

Photorefractive beam fanning was observed in almost all photorefractive crystals with a nonlocal nonlinearity. Recently we observed experimentally symmetrical beam fanning in photorefractive crystal (LiNbO 3:Fe) with a local nonlinear response.Based on forward degenerate three wave interaction,we presented a theoretical study of the symmetrical beam fanning.