增益介质的色散对锁模激光器输出脉宽和啁啾的影响

Influence of Gain Medium′s Dispersion on Pulse Width and Chirp of Mode-locked Laser

利用时间域内各光学元件的传播矩阵 ,在考虑了增益介质的色散后 ,对锁模激光器输出的脉宽和啁啾做了理论方面的推导 ,并做了相关的数值模拟 ,结果表明 :当不考虑增益介质的色散时 ,其输出脉宽啁啾值为零 ;而考虑了增益介质的色散后 ,啁啾值随色散值的增加先增加而后降低 ,且存在一个最大值 。

The propagation matrix of the mode locked optical element in the time domain was used to deduce the output chirp and pulse width when the gain medium′s dispersion was considered,a relative numerical simulation result indicates that when the gain medium′s dispersion wasn′t considered,the output chirp is null,but when the gain medium′s dispersion was considered,the output chirp is increasing and then decreasing with the increasing of the gain medium′s dispersion,and has a maximum value,the output pulse width is increasing with the increasing of the gain medium.