A tunable, passively Q-switched thulium-doped fluoride fiber laser (TDFFL) using a tungsten ditelluride (WTe₂) thin film based saturable absorber (SA) was proposed and its operational efficacy demonstrated. At a maximum pump power of 250 mW, a Q-switched output at 1494 nm with a 3-dB bandwidth of 3 nm was obtained. The repetition rate was measured to be 36.5 kHz with a minimum pulse width of 3.7 µs, as well as a signal-to-noise ratio (SNR) of approximately 42 dB. Utilizing a tunable bandpass filter (TBPF), tunable Q-switching operation was achieved from 1459 to 1513 nm, giving a tuning range of 54 nm. The proposed laser would have significant use for systems operating in the S-band region, particularly for optical communications networks.

提出了一种基于二碲化钨（WTe ₂）薄膜的可饱和吸收体（SA）的可调谐无源调Q掺th氟化物光纤激光器（TDFFL），并证明了其工作效率。在最大泵浦功率为250 mW的情况下，获得了1494 nm的Q开关输出和3 nm的3 dB带宽。测得的重复率为36.5 kHz，最小脉冲宽度为3.7 µs，信噪比（SNR）约为42 dB。利用可调带通滤波器（TBPF），可实现从1459至1513 nm的可调Q开关操作，调谐范围为54 nm。所提出的激光器将在S波段区域中运行的系统中具有重要用途，特别是在光通信网络中。