We report a wavelength-widely tunable multi-pulse gain-switched Tm³⁺-doped fiber laser. The laser has a continuous wavelength-tunable range of 105 nm in 2 μm band. The combination of Tm³⁺-doped double clad fiber and 793 nm pulsed pump source achieves large-energy pulse and multi-pulse operation. The single-pulse energy can reach 4.3 μJ and the multi-pulse energy can be 13.2 μJ. The effects of pump pulse energy, pulse repetition rate and pulse duration on multi-pulse generation are studied in detail. This easy-to-operate large-energy 2 μm pulsed fiber laser with adjustable pulse duration and repetition rate can provide a stable single-pulse or multi-pulse source in spectroscopy, medical surgery, material processing, etc.

我们报告了一种全波长可调的多脉冲增益切换 Tm ³⁺掺杂光纤激光器。该激光器在 2 μm 波段具有 105 nm 的连续波长可调范围。Tm ³⁺掺杂双包层光纤和793 nm脉冲泵浦源的组合实现了大能量脉冲和多脉冲操作。单脉冲能量可达4.3 μJ，多脉冲能量可达13.2 μJ。详细研究了泵浦脉冲能量、脉冲重复率和脉冲持续时间对多脉冲产生的影响。这种易于操作的大能量2μm脉冲光纤激光器，脉冲持续时间和重复频率可调，可为光谱学、医疗外科、材料加工等领域提供稳定的单脉冲或多脉冲源。