Influences of GVD on the characteristics of soliton in a passively mode-locked Er-doped fiber laser

In this paper, the characteristics of soliton in a passively mode-locked Er-doped fiber laser modeled by a non-distributed model are numerically investigated with the split-step Fourier method. Based on the analysis and model, sech2-shaped soliton is obtained by controlling the group velocity dispersion （GVD） and small-signal gain of the gain fiber. The law that the dispersion influences the characteristics of soliton in the mode-locked fiber laser is researched in net-cavity averaged anomalous dispersion regime.

用于飞秒脉冲锁模激光器中的优化Gires-Tournois反射镜

根据飞秒脉冲锁模钛宝石激光器腔内色散补偿的要求 ,设定负色散镜的色散目标值 ,用最优化方法 ,设计出了负色散Gires Toumois(G T)反射镜。计算了光场在优化负色散G T反射镜不同膜层内的分布。不同波长的光场分量 ,在优化负色散G T反射镜内部 ,穿透深度不同。在 72 0nm～ 90 0nm波长范围内 ,长波分量有较大的穿透深度 ,因而对长波分量提供较大的时间延迟。将其用于飞秒锁模钛宝石激光器中 ,取代传统的腔内色散补偿棱镜对 ,结合半导体可饱和吸收镜 (SESAM )自启动锁模 ,在钛宝石激光器中获得了 5 6fs脉冲。

群速度色散对非线性镜锁模激光器输出激光脉冲宽度的影响

从理论上研究了在非线性镜锁模激光器中，非线性晶体中的群速度色散对激光脉冲发展的影响．理论结果模拟了文献［５］的实验．计算表明，理论和实验基本相符合．