摘要
For a photorefractive crystal,the exponential gain coefficient of two-wave coupling,Г,is a constant.In this paper,the constantГof a LiNbO_(3):Fe crystal is measured by using Gaussian beams and quasi-uniform beams.The difference between the results is attributed to the self-defocusing effect of the crystal.
基金
Supported by the National Natural Science Foundation of China under Grant Nos.69678018 and 19734004
the Key Research Project in Climbing Program from the National Science and Technology Commission of China
the National Advanced Materials Committee of China.
