According to the nonlinear polarization rotated effect, a self-starting mode-locked ring cavity fiber laser is obtained and optimized through changing the fiber length and coupler parameters. As the seed of an all-fiber ultra-short pulse amplifier with master oscillator power amplifier (MOPA) structure, the pulse which has 2.042 W in average power,1063.8 nm in wavelength, 41.3 MHz in repetition frequency, 45 ps in impulse duration, 49.4 nJ in single pulse power and 1.1 kW in peak power is realized, taking double-cladding fiber as the gain medium. The optical conversion efficiency of the whole system is 40.8％, which could be supportable to the higher power all-fiber pulse laser.%本文利用掺Yb光纤的非线性偏振旋转效应搭建了光纤环形腔激光器,通过改变增益光纤的长度和耦合器输入输出的比例,对其进行优化,获得了稳定的自启动锁模脉冲,并以此作为种子源,采用主振荡功率放大MOPA全光纤结构,以双包层掺Yb光纤为增益介质实现了对种子源信号光的放大,获得了平均功率2.042W、中心波长1063.8 nm、重复频率41.3MHz、脉冲宽度45ps、单脉冲能量49.4 nJ,峰值功率1.1 kW的锁模脉冲激光,光光转换效率为40.8%,为实现更高功率的全光纤结构的脉冲激光系统提供了条件.
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