摘要
对两中心模型光折变晶体两波耦合增益系数Γ ,总的有效陷阱密度 Nef f和强度特性因子 η( I)的强度特性进行了理论研究。结果显示在两中心模型的光折变晶体中 ,Γ,Nef f和 η( I)有着复杂的特性。当SDγT/STγD 小时 ,对于 A类和 B类两中心晶体 ,Nef f随强度的增加而增加最终趋于饱和 ,当 SDγT/STγD大时 ,对于 A类晶体 Neff增加到一个最大值后稍有减少 ,而对于 B类晶体 ,Nef f增加到最大值后然而有较大的减少。
Intensity dependence of the two-beam coupling gain coefficient Γ, the effective trap density N eff and the intensity dependent factor η(I) is studied theoretically for the two-centre photorefractive crystals. The results show that N eff, η(I) and Γ have more complicated behaviors in two-centre crystals. When S Dγ T/S Tγ D is small, N eff increases and tends to saturate with increasing intensity for both type-A and type-B two-centre crystals. When S Dγ T/S Tγ D is large, N eff increases to a maximum and then decreases a little for type-A crystals and decreases greatly for type-B crystals.The different intensity dependence of Γ in the two types of crystals comes from their different level structures.
出处
《光学精密工程》
EI
CAS
CSCD
2001年第1期51-54,共4页
Optics and Precision Engineering
基金
山西省教委科技开发资助项目
关键词
光折变晶体
两波耦合
增益系数
强度特性
photorefractive crystals
two-wave coupling
gain coefficient
intensity dependence.
