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通过对多种频率转换方案的深入对比分析,设计了一套兼容多波长及多脉宽高效输出的频率转换系统。采用“Ⅱ+Ⅱ”类双晶体级联的方式,可以实现“偏振失配”三倍频和Ⅱ类双晶体正交级联二倍频两种模式间的快速切换。通过数值模拟程序优化了晶体构型,结果表明,当两块晶体厚度均为10mm时,可以兼顾低功率长脉冲和高功率短脉冲对效率和稳定性的需求。
Through in-depth comparative analysis of various frequency conversion schemes, a frequency conversion system compatible with multi-wavelength and multi-pulse width and high efficiency output is designed. By adopting the double crystal cascade method of “Ⅱ + Ⅱ” type, the fast switching between the two modes of “polarization mismatch” triple frequency and type Ⅱ double crystal orthogonal cascade can be realized. The crystal configuration was optimized by numerical simulations, and the results show that the efficiency and stability requirements of low power long pulse and high power short pulse can be reconciled when both crystal thickness are 10mm.