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高重复频率掺Er光纤飞秒激光器在光学频率梳、超高速光学采样等领域具有很重要的作用.本文采用非线性偏振旋转锁模机理,在掺Er光纤飞秒激光器中实现了重复频率为303 MHz的锁模脉冲输出.通过优化腔内色散,激光器腔内色散在零色散附近偏负值,锁模后工作在展宽脉冲锁模状态.在817 mW抽运功率下,激光器在连续光状态下可以输出125 mW的平均功率,在锁模状态下可以输出69 mW的平均功率,脉冲宽度为90 fs.当抽运功率处于700—817 mW时,激光器可以实现自启动锁模.激光器重复频率在5 h内的漂移量为30 Hz.
The high repetition frequency Er-doped femtosecond laser has an important role in the fields of optical frequency comb and ultra-high speed optical sampling.In this paper, the non-linear polarization rotation mode-locking mechanism is adopted in the Er-doped femtosecond laser with a repetition frequency of 303 MHz mode-locked pulse output. By optimizing the intracavity dispersion, the laser cavity dispersion in the vicinity of the zero-dispersion dispersion, work in the broadened mode-locked pulse clamping mode at 817 mW pumping power, the laser in the continuous light state Can output an average power of 125 mW and can output an average power of 69 mW at a mode-locked state with a pulse width of 90 fs. The laser can be self-starting mode-locked at a pumping power of 700-817 mW. The laser repetition rate is between The drift within 5 h is 30 Hz.