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基于目前国内规模最大的激光驱动器———“神光Ⅱ”八路基频光已经实现功率平衡运行,通过改变其中若干路三倍频系统各调谐量的偏离,对输出三倍频波形进行束与束之间的横向对比研究.研究发现,对于Ⅱ类Ⅱ类偏振失配三倍频系统,在影响转换效率的三个调谐量中,偏振分配角失配Δθp对三倍频波形影响最大;在入射基频功率密度约为1.0GWcm2情况下,当三倍频系统三个调谐量都处在最佳匹配时,三倍频波形半峰全宽τ最小.研究工作为最终实现“神光Ⅱ”八路光束三倍频功率平衡输出提供了晶体调试的方法.
Based on the current domestic largest laser driver --- “SG” octave baseband light has achieved power balance operation, by changing some of the three-way frequency of the system tuning of the deviation, the output of the third harmonic wave bundle The results show that the mismatch of polarization distribution Δθp has the strongest influence on the triplet waveform among the three tuning quantities that affect the conversion efficiency, When the fundamental frequency power density is about 1.0GWcm2, the full width at half maximum (FWHM) of the third harmonic wave is the minimum when all the three harmonic frequencies of the system are in the best match. Eight-way triple-frequency power beam output provides a crystal debugging method.