光致折射效应中空间电荷场建立过程的研究

Research on formation of space charge fieid in photorefractive effect

本文推导了包含自衍射及非线性吸收影响、用以描述空间电荷场建立过程的微分方程组,阐明了周期性的空间电荷场与光强干涉条纹之间的相位差在建立过程中所起的作用,并推导了描述条纹倾斜和弯曲的微分方程。通过数值计算找到了硅酸铋(BSO)晶体中能量转移的规律,讨论了材料特性对过程快慢的影响,提出了用CW激光来探讨瞬态过程快慢的可能性。

New equations diseribing formation of space charge field are derived by taking self-diffraction and nonlinear absorption into account. It is shown that the phase mismatch of space charge field with light intensity grating plays very important role in photorefractive effect. A equation disoribing the incline and bent of eqniphase surfaces is also derived. By using/numeric al oaoulations we find the role of energy transfer in BSO. Some material parameter will affect the speed of the process, which shows the possibility of using CW laser in studying the response to temporal process.