Opt Lett. 2018 Jun 15;43(12):2848-2851. doi: 10.1364/OL.43.002848.
The generation of high-power ultrashort pulses from a passively mode-locked fiber laser is reported based on the combination of a single-polarization large-mode-area (LMA) photonic crystal fiber with a nonlinear amplifying loop mirror design. The introduction of a non-reciprocal phase shift in the loop mirror enables self-starting of the mode-locked laser, while the polarizing LMA fiber supports environmentally stable high-power operation. Mode locking in the soliton-like, stretched-pulse, and all-normal-dispersion regime is characterized. The laser generates stable pulses with up to 2 W average power at a 72 MHz repetition rate, corresponding to a single-pulse energy of 28 nJ. The output pulses are dechirped to a near transform-limited duration of 152 fs. The proposed fiber oscillator presents an alternative approach to high-power ultrafast laser sources, along with environmental stability.
基于单偏振大模场（LMA）光子晶体光纤与非线性放大环形镜设计的结合，我们报道了一种从被动锁模光纤激光器中产生高功率超短脉冲的方法。环形镜中引入非互易相移可实现锁模激光器的自启动，而偏振 LMA 光纤则支持环境稳定的高功率运行。我们对孤子型、展宽脉冲和全正色散区的锁模进行了特性描述。该激光器在 72MHz 的重复率下可产生高达 2W 平均功率的稳定脉冲，对应于 28nJ 的单脉冲能量。输出脉冲被去啁啾到接近变换极限的 152fs 持续时间。所提出的光纤振荡器为高功率超快激光源提供了一种替代方法，同时具有环境稳定性。
