实现激光腔长计算，满足热透镜效应，适用于全固态激光器(Realization of cavity length calculation)

NALM锁模激光器仿真，非线性环路反射镜锁模获得飞秒激光脉冲。(The simulation of NALM mode-locked laser shows that the femtosecond laser pulse can be obtained by mode-locked non-linear loop mirror.)