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在高功率固体激光器的终端光学组件中,为了提升三倍频转换效率,对大口径薄型KDP晶体采取两侧支撑的夹持方法,并利用有限元分析软件建立了夹持系统的仿真模型。在此基础上,计算分析了晶体以不同倾斜角度放置时,支撑条数目和长度等夹持系统结构参数对晶体附加面形、相位匹配角及三倍频转换效率的影响。研究结果表明:晶体两侧支撑条总数为4时,大口径薄型KDP晶体附加面形的峰谷值和均方根值、晶轴变化的平均值和三倍频转换效率随支撑条长度的变化不大,且可获得理想的三倍频转换效率。解决了反复调试KDP晶体面形质量的问题而缩短了工程装校时间。
In the terminal optical module of high-power solid-state laser, in order to improve the conversion efficiency of the triplet frequency, a clamping method of supporting the large diameter thin KDP crystal on both sides is adopted, and the simulation model of the clamping system is established by using the finite element analysis software. On this basis, the influence of the structure parameters of the holding system, such as the number and length of the supporting bars, on the additional surface shape, the phase matching angle and the third harmonic conversion efficiency of the crystal when the crystal is placed at different tilt angles is calculated and analyzed. The results show that when the total number of support strips on both sides of the crystal is 4, the additional topography of the large-diameter thin-shaped KDP crystal shows the peak-to-valley and root-mean-square values, the mean value of the crystal axis variation and the triplet- Not large, and can obtain the ideal triple frequency conversion efficiency. Solve the problem of repeatedly debugging the surface quality of KDP crystal and shorten the installation time of the project.