Abstract. The dissipative soliton resonance (DSR) pulses are demonstrated experimentally in an all polarization-maintaining (PM) thulium-doped mode-locked fiber laser. The mode-locked operation is achieved using of the nonlinear amplifying loop mirror mechanism (NALM). Each loop of the apparatus includes an independently controlled amplifier and a section of gain fiber. The experiment is carried out at a central wavelength of 1969.8 nm and 3.5 ns as the maximum output pulse width. The time domain and spectrum characteristics of output pulse are analyzed with different positions of PM-1950 fiber in the NALM loop. In addition, the DSR pulse properties are experimentally verified by changing the length of the PM-1950 fiber spliced into the NALM loop. We have achieved environmentally stable mode-locked pulses at 3, 2.1, and 1.62 MHz corresponding to the maximum pulse energies of 6.8, 20, and 29.1 nJ. The output pulse is stable and robust at different ambient temperatures.

中文翻译：

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2μm全偏振保持被动锁模光纤激光器中的方波脉冲

摘要。耗散孤子共振 (DSR) 脉冲在全保偏 (PM) 掺铥锁模光纤激光器中进行了实验证明。锁模操作是使用非线性放大环路镜机制 (NALM) 实现的。该装置的每个回路包括一个独立控制的放大器和一段增益光纤。实验以1969.8 nm的中心波长和3.5 ns为最大输出脉冲宽度进行。分析了PM-1950光纤在NALM回路中不同位置的输出脉冲的时域和频谱特性。此外，通过改变拼接到 NALM 回路中的 PM-1950 光纤的长度，通过实验验证了 DSR 脉冲特性。我们已经在 3、2.1 和 1 下实现了环境稳定的锁模脉冲。62 MHz 对应于 6.8、20 和 29.1 nJ 的最大脉冲能量。输出脉冲在不同环境温度下稳定且稳健。