We report on an Yb-doped all-polarization maintaining fiber mode-locked laser based on nonlinear-amplifying-loop mirror and 3 × 3 coupler. Thanks to this coupler inducing a non-reciprocal phase-bias, the mode-locked regime can be easily achieved at the high repetition rate of 52 MHz. The cavity delivers an average power of 62 mW corresponding to a pulse energy of 1.2 nJ. We have finally demonstrated an extra-cavity nonlinear spectral stage induced by the propagation along a standard nonlinear fiber. The pulse can be then compressed down to 178 fs via a grating compressor and the corresponding peak power is then around 6 kW.

中文翻译：

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基于3×3耦合器的全偏振保持光纤8型激光器在1μm处产生178 fs，1.2 nJ脉冲

我们报告了基于非线性放大环镜和3×3耦合器的掺Yb的全偏振保持光纤锁模激光器。由于这种耦合器产生不可逆的相位偏置，因此可以在52 MHz的高重复频率下轻松实现锁模状态。腔体提供62 mW的平均功率，对应于1.2 nJ的脉冲能量。我们最终证明了沿标准非线性光纤的传播引起的腔外非线性光谱级。然后可以通过光栅压缩器将脉冲压缩到178 fs，然后相应的峰值功率约为6 kW。