大口径KDP晶体最佳偏转角预测误差分析  

Prediction of Optimum Deflection Angles and Errors Analysis for KDP Crystals with Large Aperture

作　　者：李婷[1] 张洋[1,2] 徐旭[2] 张彬[1] 

机构地区：[1]四川大学电子信息学院,四川成都610065 [2]中国工程物理研究院激光聚变研究中心,四川绵阳621900

出　　处：《中国激光》2014年第8期11-16,共6页Chinese Journal of Lasers

基　　金：国家重大专项应用基础项目(GFZX025010502.7);四川省教育厅创新团队计划(13Td0048)

摘　　要：通过测量晶体全口径正交偏振透射波前的干涉数据,建立了计算KDP晶体最佳偏转角的理论模型,并通过实验验证了理论的正确性和有效性。在探针激光工作稳定及环境温度稳定的情况下,理论预测值与实验结果的变化趋势相同,且差值在10.0μrad以内。分析了影响测量精度的各种因素,找出了理论预估值与实验结果产生差异的主要原因。由单点模型推广建立了全口径KDP晶体最佳偏转角的计算模型,并且数值模拟了KDP晶体折射率不均匀性对晶体全口径最佳入射角和转换效率产生的影响。得到的结果为工程上实现大口径KDP晶体精密装校提供了理论指导。By measuring the transmitted wavefront of crystals with orthogonal polarization interferometry（OPI）, the model for determining the deflection angle of KDP crystals is established, and the theory is further verified to be correct and efficient by experiments. Under the stable conditions of probe laser and working temperature, the variation trend of prediction values is consistent with that of measurement results, and the difference is within 10.0 μrad. Furthermore, the factors affecting the measurement precision are analyzed and the differences between the theory and measurement results are pointed out. The model of the optimum deflection angles of full aperture for KDP crystals is established according to the single point model. In addition, the influence of crystal refractive-index non-uniformity on the optimum deflection angles of full aperture for crystals and conversion efficiency is also simulated numerically. The results obtained in this paper provide theoretic guidances for accurate prediction of KDP crystals in the engineering project.

关 键 词：光学器件 KDP晶体 折射率不均匀性 最佳偏转角 误差分析 

分 类 号：O439[机械工程—光学工程]