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基于两块不同尺寸的Cu∶KNSBN晶体自抽运相位共轭实验,研究了光折变晶体的几何结构及入射角度对自抽运相位共轭特性的影响,得到在入射位置不变化的情况下,随着入射角度的变化相位共轭光输出有最大值,几何结构不同对应的最大值不同。并从理论上分析了晶体结构及入射角度在双作用区自抽运相位共轭机理中的作用,指出几何结构、入射角度与自抽运光通道、耦合系数的关系,及在自抽运相位共轭效应中存在一个最佳入射角度,这时相位共轭光输出最大。最后,对理论上的相位共轭反射率公式进行了修正。对自抽运相位共轭实际应用中,选择最佳入射角度提供了理论和实验依据。
Based on the self-pumping phase conjugation experiments of two different Cu:KNSBN crystals, the effects of the photorefractive crystal geometry and the incident angle on the self-pumping phase conjugate properties were studied. , The phase conjugate light output has the maximum value as the incident angle changes, and the maximum corresponding to different geometric structures is different. The effect of crystal structure and incident angle on the self-pumping phase conjugation mechanism in double-action region is theoretically analyzed. The relationship between the geometrical structure, incident angle, self-pumping light path and coupling coefficient, There is an optimal angle of incidence in the conjugate effect, where the phase conjugate light output is the largest. Finally, the theoretical phase conjugate reflectivity formula was revised. In the practical application of self-pumping phase conjugation, the choice of the best angle of incidence provides theoretical and experimental basis.