实验研究了基于非线性放大环形镜锁模的全正色散可调谐锁模光纤激光器, 激光器采用由主环路和非线性放大环形镜环路构成的“8”字腔全保偏结构。通过调节两环路的抽运功率, 在1030 nm处获得了脉宽为17.61 ps, 重复频率为4.133 MHz, 平均功率为2.151 mW的稳定锁模激光输出。通过调节可调谐滤波器, 在控制激光器工作波长的同时滤波形成全正色散耗散孤子, 实现了1015~1080 nm可调谐稳定锁模激光输出, 脉冲宽度变化范围为7.86~17.80 ps。

An all-normal dispersion tunable mode-locked fiber laser with a nonlinear amplifying loop mirror is experimentally investigated. The laser employs an all-polarization-maintaining figure-8 cavity consisted of main loop and nonlinear amplifying loop mirror. At 1030 nm, the stable mode-locked laser is initiated by adjusting two loops′ pump power, which delivers pulse width of 17.61 ps, repetition frequency of 4.133 MHz, and average power of 2.151 mW. A tunable filter is employed in the cavity to select the laser wavelength as well as force the laser operating in all-normal dispersion dissipative regime. The wavelength tuning range is 1015-1080 nm while the pulse duration ranges from 7.86 ps to 17.80 ps.