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为满足全光采样系统对低时域抖动、窄脉冲宽度和高重复频率飞秒光纤激光器的需求,结合数值仿真,在实验的基础上利用非线性偏振旋转锁模原理,初步实现了自由运转被动锁模掺铒飞秒光纤激光器,激光器锁模输出脉冲的基本重复频率为6.028 MHz,平均输出功率为1.07 mW,中心波长为1 570.3 nm,光谱宽度为33.2 nm,理论推算出傅里叶变换受限脉冲的时域宽度为78 fs;通过增大输出耦合器的分束比,可以提高锁模输出脉冲的平均功率;同时,测量了锁模脉冲基本重复频率的稳定性。该激光器的操作和调节简单,在锁模情况下能够长时间稳定运行,其全光纤结构更有利于小型化和便携化。
In order to meet the demand of all-optical sampling system for low time-domain jitter, narrow pulse width and high repetition rate femtosecond fiber lasers, the principle of non-linear polarization rotation mode-locking based on the experiment was combined with numerical simulation. The mode-locked erbium-doped femtosecond fiber laser has a fundamental repetition frequency of 6.028 MHz, an average output power of 1.07 mW, a center wavelength of 1 570.3 nm and a spectral width of 33.2 nm. The theoretical calculation of the Fourier transform The time-domain width of the limit pulse is 78 fs. The average power of the mode-locked output pulse can be increased by increasing the splitting ratio of the output coupler. Meanwhile, the stability of the fundamental repetition frequency of the mode-locked pulse is measured. The laser operation and regulation is simple, in the case of clamping mode can be a long time stable operation, the all-fiber structure is more conducive to miniaturization and portability.