The results of investigation of the possibility of reducing the duration of the second-harmonic radiation pulse generated by the starting complex of an THL-100 laser system by conversion of a pre-chirped fundamental frequency pulse are presented. A front-end compressor of the complex is used to obtain a fundamental harmonic pulse chirp at a central wavelength of 950 nm with duration of 70 fs. It is shown that a small excess of the group velocity dispersion (±3200–4000 fs 2 ) of fundamental frequency radiation increases the width of the second-harmonic radiation spectrum by a factor of 1.5–2. A compensation for the excess dispersion of radiation pulses with broadened spectrum makes it possible to reduce the second-harmonic radiation pulse duration approximately proportionally to its spectral broadening and to obtain a minimal pulse duration of 35 fs.

中文翻译：

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基频脉冲啁啾对频谱和时间二次谐波特性的影响

介绍了通过转换预啁啾基频脉冲来减少由 THL-100 激光系统的起始复合体产生的二次谐波辐射脉冲持续时间的可能性的调查结果。该复合体的前端压缩器用于获得中心波长为 950 nm、持续时间为 70 fs 的基波谐波脉冲啁啾。结果表明，基频辐射的群速度色散（±3200-4000 fs 2 ）稍有过量，二次谐波辐射谱的宽度就增加了 1.5-2 倍。