夹持方式对KDP晶体三倍频转换效率的影响
Influence of clamping modes in KDP crystal on conversion efficiency of third harmonic generation
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摘要: 针对压条固定方式、粘胶固定方式和全外围夹持方式进行理论建模和数值计算分析，并讨论了不同夹持方式的优缺点及其对KDP晶体面形和三倍频转换效率的影响。研究结果表明：晶体面形形变对高斯光束三倍频转换效率的影响明显小于平面波时的情况。当入射基频光光强为6 GW·cm-2时，对于平面波的情况，压条固定方式、粘胶固定方式和全外围夹持方式3种夹持方式相对于不考虑夹持作用时的三倍频转换效率分别减小7.5%，9.0%和7.2%；对于高斯光束的情况，三倍频转换效率分别减小了1.3%，1.0%和1.5%。Abstract: Theoretical modeling has been used to discuss advantages and disadvantages among the squash fixed mode, the silica fixed mode and the complete periphery clamping mode in this paper. Besides, numerical calculation has been used to analyze the influence on KDP surface and conversion efficiency. The results show that the conversion efficiency reduction of Gaussian beam is less than that of plane wave caused by surface deformation. when the intensity of fundamental frequency laser is up to 6 GW·cm-2, the conversion efficiencies reduce 7.5%, 9.0% and 7.2% to plane wave, respectively; and the conversion efficiencies reduce 1.3%, 1.0% and 1.5% to Gaussian beam, respectively.
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Key words:
- inertial confinement fusion /
- clamp mode /
- kdp crystal /
- conversion efficiency
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