Rhenium disulfide (ReS2) is a novel two-dimensional (2D) material member in the transition metal dichalcogenides (TMDs) family, which shows unusual saturable absorption properties. A compact and reliable passively Q-switched Yb3+-doped fiber laser at 1047 nm was achieved with ReS2 saturable absorber (SA) by mechanical exfoliation method fabricated, which achieved pulse duration decreases from 3.32 μs to 1.56 μs and the repetition rate increases from 52 kHz to 134 kHz with the pump power from 56 mW to 200 mW, corresponding to pulse energy and peak power increases from 6.06 nJ to 13.02 nJ and 1.83 mW to 8.13 mW, respectively. To the best of our knowledge, this is the first report in the 1 μm with ReS2 for short-pulsed generation. Our results prove that layered ReS2 is a new saturable absorber for short-pulsed lasers.

We have reported a mode-locked pulse energy tunable ytterbium-doped fiber laser constructed by the polarization-maintaining (PM) fibers with a position-tunable focuser and a semiconductor-saturable absorber mirror (SESAM). The narrow bandwidth fiber Bragg grating in the cavity produces self-starting picosecond (ps) mode-locked operation. The linear laser cavity achieved tunable single pulse energy varied from 0.591 to 0.988 nJ, with a 24.7-MHz repetition rate and a 6.03-ps pulse duration at 1064.18 nm. High environmental stability is also confirmed by a high polarization extinction ratio over 17.8 dB.

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