In this paper, we investigated the influence of Semiconductor Saturable Absorber Mirror (SESAM) parameters on pulse evolution of passively mode-locked fiber laser at different repetition rates. Based on the Nonlinear Schrodinger Equation, the mode-locked process of the SESAM passively mode-locked fiber laser and the pulse evolution were simulated. Furthermore, the impact of modulation depth of a SESAM together with saturation intensity on mode-locking at different repetition rates have been analyzed. According to the simulation, at low repetition rate, when the laser operates at mode-locked state, the modulation depth of SESAM is larger, while the modulation depth is smaller when pulse modulation phenomenon caused by excessive modulation depth occurs in the cavity. At high repetition rate, the range of saturation intensity is much larger when the laser operates at mode-locked state. The presented numerical study provides valuable guidance for the design and development of mode-locked fiber lasers operating at different repetition rates.

在本文中，我们研究了半导体饱和吸收镜 (SESAM) 参数对不同重复频率下被动锁模光纤激光器脉冲演化的影响。基于非线性薛定谔方程，模拟了SESAM被动锁模光纤激光器的锁模过程和脉冲演化。此外，还分析了 SESAM 的调制深度和饱和强度对不同重复频率下锁模的影响。根据仿真，在低重复频率下，激光器工作在锁模状态时，SESAM的调制深度较大，而当腔内出现调制深度过大引起脉冲调制现象时，调制深度较小。在高重复率下，当激光器工作在锁模状态时，饱和强度的范围要大得多。所提出的数值研究为以不同重复率工作的锁模光纤激光器的设计和开发提供了宝贵的指导。