Abstract
ABSTRACTA new formula of saturation 'inteilsity defined as the ratio of thermal emission rate to photoexcitation constantfor photorefractive material is derived and a new iriethod for the saturation intensity measurement in aphotorefractive crystal based on detecting intensity gain in two-wave mixing is presented. The temperature dependence of the saturation intensity for Ce:Mn:LiNbO3 crystal is measured. The measured values for the saturation intensity has been checked with another experiment of two-wave mixing in the crystal. KEYWORDS: Photorefractive effect, twowave mixing , saturation intensity, temperature dependence 1. INTRODUCTIONFor photorefractive material, a saturation intensity, denoted by J, defined as the ratio of thermal emission rate to photoexcitation constant1, is an important parameter because its value decides how large the total incident intensity, denoted by I , should be taken in a crystal. The larger the I the stronger the J should be taken. Otherwise, Jand its temperature dependence can provide the information of impurity level location in gap. Therefore, it is verysignificant to determine J and its temperature dependence exactly not only for photorefractive nonlinear optics, but
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