We report on the dissipative soliton generation in a 1.7-μm net-normal dispersion Tm-doped fiber laser by nonlinear polarization rotation technique. An intra-cavity bandpass filter was employed to suppress the long-wavelength emission, while the cavity dispersion was compensated by a segment of ultrahigh numerical aperture (UHNA4) fiber. The dissipative soliton with a central wavelength of 1746 nm was obtained, covering a spectral range from 1737 nm to 1754 nm. The de-chirped duration and energy of the dissipative soliton were 370 fs and 0.2 nJ, respectively. In addition, the dynamics of multiple dissipative solitons were also investigated. Through optimization of the cavity dispersion, the 50 nm broadband dissipative soliton with de-chirped pulse duration of 230 fs could be achieved. The development of dissipative soliton seed laser represents the first step in achieving the chirped pulse amplification system at the 1.7-μm wave band, which would find potential applications in fields such as biomedical imaging and material processing.

中文翻译：

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1.7μm耗散孤子Tm掺杂光纤激光器

我们报告了通过非线性偏振旋转技术在1.7μm净正色散Tm掺杂光纤激光器中耗散孤子的产生。腔内带通滤波器用于抑制长波发射，而腔色散由一段超高数值孔径（UHNA4）光纤补偿。获得了中心波长为1746 nm的耗散孤子，覆盖了1737 nm至1754 nm的光谱范围。耗散孤子的去-持续时间和能量分别为370 fs和0.2 nJ。此外，还研究了多个耗散孤子的动力学。通过优化腔体色散，可以实现具有250 fs的去chi脉冲持续时间的50 nm宽带耗散孤子。