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报道了一种改进的非线性放大环形镜锁模激光器,即在传统的8字腔和σ腔中,通过加入非互易性元件的方式,有效缩短了光纤长度,降低了非线性积累量,从而提升锁模激光器的重复频率,并且可以改善激光器的自启动特性。传统的“8”字腔保偏光纤激光器必须借助半导体可饱和吸收镜、碳纳米管等真实可饱和吸收体才能锁模运转。本文只利用非互易性元件,在改进的“8”字腔全保偏(PM)掺铒光纤激光器中,实现了重复频率为22 MHz,平均功率为23.6 m W的孤子锁模单脉冲激光输出,直接输出脉宽为308 fs。传统的“8”字腔光纤激光器的重复频率限制在10 MHz水平。通过加入非互易性元件,本文在改进的“σ”腔非保偏掺铒光纤激光器中,在呼吸孤子锁模域获得了重复频率为80 MHz,平均功率为36 m W的单脉冲激光输出;在正色散域获得了重复频率为53.6 MHz,平均功率为14 m W的单脉冲激光输出。
An improved non-linear magnifying toroidal mode-locked laser is reported. In the traditional 8-word cavity and sigma cavity, the non-reciprocal element is added to effectively shorten the fiber length and reduce the non-linear accumulation, Thereby increasing the repetition frequency of the mode-locked laser and improving the self-starting characteristics of the laser. Traditional “8” word-cavity PM fiber lasers must be mode-locked by means of real saturable absorbers such as semiconducting saturable absorption mirrors and carbon nanotubes. In this paper, we use a nonreciprocal component to achieve a soliton-modeled single-shot with a repetition frequency of 22 MHz and an average power of 23.6 mW in an improved “erbium-doped fiber laser” Pulse laser output, the direct output pulse width of 308 fs. The repetition frequency of the traditional “8 ” cavity fiber laser is limited to 10 MHz. By adding the nonreciprocal components, a monopulse with a repetition frequency of 80 MHz and an average power of 36 mW was obtained in a modified “σ” cavity non-polarization maintaining erbium-doped fiber laser in the mode of the breathing soliton. Laser output; single pulse laser output with a repetition frequency of 53.6 MHz and an average power of 14 mW was obtained in the positive dispersion domain.