Abstract We succeed in developing a chemically synthesized tellurium nanocrystals (Chem-Te) thin film by liquid phase peeling technique, and demonstrate this material is an effective saturable absorber (SA) for realization of stable mode-locking in an all-fiber structured thulium-doped laser cavity. By integrating this SA into an all-fiber structured ring laser cavity, we obtained the mode-locked pulses at the repetition rate of 11.17 MHz, the achieved pulses spectral bandwidth FWHM (full width at half maximum) of 5.26 nm and the pulses duration of 890 fs with 620 mW pump power at 1560 nm, the fundamental mode-locked laser output power as high as 5.35 mW. In addition, by further increasing the pump power, the second-order and third-order harmonic mode-locked pulses train of this fiber laser were also observed. To the best of our knowledge, this is the first report on the novel Chem-Te material saturable absorption property realization in 2 μm-band fiber laser system.

中文翻译：

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由新型Chem-Te可饱和吸收体锁模的Tm掺杂全光纤结构飞秒激光器

摘要 我们通过液相剥离技术成功开发了化学合成的碲纳米晶体 (Chem-Te) 薄膜，并证明该材料是一种有效的可饱和吸收体 (SA)，可在全纤维结构的铥中实现稳定的锁模。掺杂激光腔。通过将这种 SA 集成到全光纤结构的环形激光腔中，我们获得了重复率为 11.17 MHz 的锁模脉冲，实现了 5.26 nm 的脉冲光谱带宽 FWHM（半高宽）和脉冲持续时间为890 fs，1560 nm 泵浦功率 620 mW，基本锁模激光器输出功率高达 5.35 mW。此外，通过进一步提高泵浦功率，还观察到该光纤激光器的二阶和三阶谐波锁模脉冲序列。据我们所知，