We experimentally demonstrate the generation of soliton-like pulses with 195–230 fs duration and energy up to 20 nJ in the spectral region of 1.9–2.5 µ m directly from the Tm-doped all-fiber MOPA laser. The emerged Raman solitons generated directly in the fiber amplifier exhibit unusual dynamics and spectral properties forming a supercontinuum without conventional gaps between Stokes pulses. Namely, at the output powers above 2 W, in addition to conventional soliton spectral peaks beyond 2.3 μ m, we observe high spectral density over an extended range of 1.95–2.23 μ m corresponding to a coherent structure that to the best of our knowledge differs from any previously observed supercontinuum regimes. The average optical power of the fiber laser is at the 3-W level, whereas the estimated peak power reached the 80-kW level. Such a relatively simple laser system with high spectral density is a promising light source for various applications ranging from advanced com...

中文翻译：

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在1.9–2.5 µm谱域中产生高能类孤子脉冲

我们通过实验证明了直接从Tm掺杂的全光纤MOPA激光器中产生的类孤子脉冲的持续时间为195–230 fs，在1.9–2.5 µm的光谱范围内能量高达20 nJ。直接在光纤放大器中产生的拉曼孤子呈现出异常的动力学和光谱特性，形成超连续谱，而斯托克斯脉冲之间没有常规间隙。也就是说，在高于2 W的输出功率下，除了传统的孤子谱峰超过2.3μm外，我们还观察到1.95–2.23μm扩展范围内的高光谱密度，这与我们所知的相干结构不同来自任何先前观察到的超连续谱体系。光纤激光器的平均光功率为3 W，而估计的峰值功率达到80 kW。