一般切割面的铋硅族氧化物光折变增益特性及动态光栅优化

利用耦合张量对光折变旋光，电光，压电及弹光铋硅族氧化物晶体中光波本征模的作用，在任意晶体切割面上求解了弱耦合的矢量波耦合方程, 并利用有效耦合概念处理了非旋光晶体 中的矢量波耦合问题. 进而计算旋光和非旋光材料中信号光的增益, 并分别比较各向同性耦 合和各向异性耦合对增益的影响. 对旋光材料优化增益，并把处理结果应用于BSO和BTO晶体 . 还讨论了压电和弹光效应对(110)，(111)及(112)切割面优化增益的影响. 关键词： 铋硅族氧化物 光折变 旋光效应 压电 弹光效应

Photorefractive gain property and optimization of dynamic holographic gratings in arbitrarily cut sillenite crystal

We study the influence of vectorial wave coupling on the wave eigenmodes in an arbitrarily-cut photorefractive and optically active piezo-electric sillenite cry stal, and solve the vectorial equations for weak two-wave coupling. We deal exac tly with the vectorial wave coupling in an optically inactive piezo-electric cry stal by solving the scalar equations. By doing so we calculate the signal gains in the optically active and the optically inactive crystals and discuss the cont ributions of the isotropic and the anisotropic coupling to the gain, respectivel y. We optimize the signal gain of the optically active crystal and apply the re sults to a BSO and BTO crystal. We also investigate the influence of the piezo-e lectric and elasto-optic effect on the optimum gain for (110),(111),(112) and th eir equivalent cuts.