Opt Lett. 2015 Aug 1;40(15):3500-3. doi: 10.1364/OL.40.003500.
In this Letter, we present a figure-eight all-PM-fiber laser oscillator design with a nonlinear optical loop mirror as an artificial saturable absorber. Unlike previous constructions using the same mode-locking technique, our cavity is constructed entirely of polarization-maintaining (PM) fibers, making the oscillator more resistant to thermal and mechanical perturbations. Two simple and robust laser configurations that differ by the output coupling ratio (70% or 30%) are presented. The first configuration delivers high energy pulses of 3.5 nJ, and the second configuration delivers pulses of 1.6 nJ at a common repetition rate of 15 MHz. In either configuration, the pulsed operation is stable, and the laser operates in a single pulse train regime, even for pump powers approaching twice the power required for mode-locking. We have also observed that, at higher intracavity powers, stimulated Raman scattering plays a significant role.
在这封信件中，我们提出了一种具有非线性光环形镜作为人工可饱和吸收体的八字形全保偏光纤激光振荡器设计。与之前使用相同锁模技术的构造不同，我们的腔完全由保偏（PM）光纤构成，这使得振荡器更能抵抗热和机械扰动。我们提出了两种简单而坚固的激光结构，它们的输出耦合比（70%或 30%）不同。第一种结构可提供 3.5 nJ 的高能量脉冲，而第二种结构可在 15 MHz 的公共重复率下提供 1.6 nJ 的脉冲。在这两种结构中，脉冲操作都是稳定的，并且激光以单脉冲串模式运行，即使在接近锁模所需功率两倍的泵浦功率下也是如此。我们还观察到，在更高的腔内功率下，受激拉曼散射起着重要作用。
