A tunable, passively Q-switched thulium doped fluoride fibre (TDFF) laser using a reduced-graphene oxide-silver (rGO-Ag) thin film as a saturable absorber (SA) for S band operation is proposed and its efficacy demonstrated. Over a pump power range of 91.4 mW up to 158.6 mW, passively generated Q-switched pulses are observed with repetition rates from 20 to 34.5 kHz and pulse widths from 3.1 to 7.1 µs. The highest pulse energy observed is 101.2 nJ with a signal to noise ratio of ∼42 dB. The proposed laser has a tuning range ∼52 nm from 1458 to 1510 nm with a tunable bandpass filter (TBPF) introduced into the cavity.

中文翻译：

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使用还原氧化石墨烯-银 (rGO-Ag) 作为可饱和吸收体的可调谐被动调 Q 掺杂氟化铥光纤 (TDFF) 激光器

提出了一种使用还原氧化石墨烯-银 (rGO-Ag) 薄膜作为 S 波段操作的可饱和吸收体 (SA) 的可调、被动调 Q 掺铥氟化物光纤 (TDFF) 激光器，并证明了其功效。在 91.4 mW 至 158.6 mW 的泵浦功率范围内，观察到被动生成的 Q 开关脉冲，重复频率为 20 至 34.5 kHz，脉冲宽度为 3.1 至 7.1 µs。观察到的最高脉冲能量为 101.2 nJ，信噪比约为 42 dB。所提出的激光器的调谐范围约为 52 nm，从 1458 到 1510 nm，在腔中引入了可调谐带通滤波器（TBPF）。