Ce:KNSBN光折变晶体两波耦合特性研究

Study of Two-Wave Coupling in Ce:KNSBN Photorefractive Crystal

采用Ar+ 514.5nm的o光和e光测量了Ce:KNSBN晶体两波耦合增益系数随写入光夹角的变化关系曲线 ,得到了Ce:KNSBN晶体的有效电荷密度、有效电光系数和电子 -空穴对抗率等参数.依据光折变理论对增益系数随写入光夹角变化关系实验数据进行了拟合 。

Two-wave coupling gain coefficient for extraordinary and ordinary polarized Ar+514.5 nm laser beam in a Ce:KNSBN photorefractive crystal is measured with respect to the angle between the writing beams. The parameters of the crystal such as electron-hole competition factor, the effective electro-optical coefficient and the effect charge density are obtained. Based on the couple-wave-theory, the variation of the gain coefficient is fitted as a function of the angle between the writing beams and the fitting result agrees with the experimental data.