The influence of saturable absorber parameters on the operation regimes of a dumbbell-shaped thulium fibre laser is studied. As saturable absorbers, polymer films with nanotubes characterised by different transmission coefficients in the saturated and unsaturated states are used. The operation of lasers with absorbers of different configurations used to obtain stable Q-switching and mode-locking regimes in the spectral range 1930 – 1960 nm is demonstrated. The average output power in the single-pulse mode-locking regime is 3.5 mW at a pulse repetition rate of 8.4 MHz and a pulse duration of 1.08 ps.

中文翻译：

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可饱和吸收体参数对哑铃形铥光纤激光器工作状态的影响

研究了可饱和吸收体参数对哑铃形铥光纤激光器工作状态的影响。作为可饱和吸收体，使用具有在饱和和不饱和状态下具有不同透射系数的纳米管的聚合物薄膜。演示了具有不同配置的吸收器的激光器的操作，用于在 1930 – 1960 nm 的光谱范围内获得稳定的Q开关和锁模机制。单脉冲锁模机制下的平均输出功率为 3.5 mW，脉冲重复率为 8.4 MHz，脉冲持续时间为 1.08 ps。