啁啾脉冲堆积宽带激光的三次谐波产生
Third harmonic generation of broadband laser by chirped pulses stacking method
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摘要: 针对啁啾脉冲堆积方法获得的宽带激光，分析了其形成机制，并给出了其时间波形和光谱分布。采用KDP晶体Ⅰ/Ⅱ类角度失谐的三倍频方案以及Ⅰ/Ⅱ/Ⅱ晶体级联角度失谐方案，定量分析了啁啾脉冲堆积方式宽带激光三倍频转换效率随入射光强、带宽、以及晶体厚度等因素的变化，并与时间相位调制的宽带激光三倍频的相应结果进行了比较。研究结果表明，采用晶体级联方式可以大幅度提高宽带三倍频转换效率，并且啁啾脉冲堆积宽带激光的三倍频转换效率的提高比时间相位调制宽带激光更为明显。Abstract: For the broadband laser obtained by chirped pulses stacking(CPS) method, the physical mechanism has been analyzed and the temporal shape and the spectrum distribution have been given. The effects of the intensity and bandwidth of the incident fundamental field on the third harmonic conversion efficiency of CPS laser using type Ⅰ/Ⅱ and type Ⅰ/Ⅱ/Ⅱ angle-detuning schemes have been analyzed quantitatively. The numerical calculation results have been compared with those of temporal phase modulation(TPM) broadband laser. The results indicate that the Ⅰ/Ⅱ/Ⅱ angle-detuning scheme can increase the third harmonic conversion efficiency obviously, and the third harmonic conversion efficiency of CPS laser can be increased more obviously than that of TPM laser.
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