晶体级联方式的宽带三倍频方案分析
Analysis of third harmonic generation of broadband laser using cascaded crystals
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摘要: 讨论了入射基频光频谱宽度、两块和频晶体失谐角对KDP晶体Ⅰ/Ⅱ/Ⅱ类角度失谐级联方式的三倍频光功率谱分布的影响，分析了影响三倍频效率的因素。研究结果表明，第二块和频晶体得到的三倍频光的功率谱分布与基频光功率谱分布及失谐角有关，三倍频光频谱宽度近似为基频光的3倍，采用该方案的三倍频可有效抑制由于基频光时间相位调制导致的三倍频光强随时间分布的不均匀，并能有效提高大带宽条件下的三倍频转换效率。同时，采用该方案的三倍频，对级联的两块和频晶体厚度及失谐角调整精度要求不高，在实验上有很大的可操作性。Abstract: By using one type Ⅰ doubling and two type Ⅱ tripling KDP crystals in quadrature, the influence of the bandwidth of the fundamental field and the detuning angles of the mixers on the power spectrum of the third harmonic field has been discussed. The factors influencing the conversion efficiency of the third harmonic field has also been analyzed. It is shown that the distribution of the power spectrum of the third harmonic field depends on the bandwidth of the input fundamental field and the detuning angles of the mixing crystals. The bandwidth of the third harmonic field is nearly 3 times that of the input fundamental field. Furthermore, the non-uniformity of the temporal profile of the third harmonic field induced by the temporal modulation of the fundamental field can be improved and th
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