Design of compatible harmonic generation system for multi wavelength and multiple pulse-width laser output
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摘要: 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10 mm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。Abstract: By comparing and analyzing various frequency conversion schemes, a compatible harmonic generation system has been designed. With type-Ⅱ-type-Ⅱ crystal combination configuration, polarization mismatch third harmonic generation and type-Ⅱ orthogonal quadrate second harmonic generation can be quickly switched. The thicknesses were optimized to be 10mm for both crystals by numerical simulation method, as a result, the requirements of high efficiency for long pulse with low intensity, as well as high stability for short pulse with high intensity, can be satisfied.
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