Fig. 1. (a) SEM image, EDS elemental mapping and spectrum of Re, S, and Se. (b) AFM topography, (c) height diagram of a ReS1.02Se0.98 flake on a SiO2/Si substrate. (d) HRTEM image, (e) XPS profiles, and (f) Raman spectra of a ReS1.02Se0.98 flake.

Fig. 2. Nonlinear absorption of a ReS1.02Se0.98 SA.

Fig. 3. Schematic of the all-fiber Q-switched EDF laser cavity.

Fig. 4. (a) Pulse trains of Q-switching operation at pump power of 600 mW; inset: the corresponding pulse width. (b) RF spectrum (measured with 100 Hz RBW) of Q-switching operation with a ReS1.02Se0.98 SA at a center frequency of 128 kHz.

Fig. 5. (a) Pulse duration and repetition rate versus incident pump power of the Q-switched mechanism. (b) Output average power and pulse energy versus incident pump power of Q-switched operation. (c) The wavelength spectrum of the Q-switched EDF laser at the pump power of 300 mW.

Fig. 6. Diagram of the mode-locked fiber laser setup with a ReS1.02Se0.98 SA.

Fig. 7. (a) Pulse trains of mode-locking operation at pump power of 530 mW; inset: oscilloscope trace. (b) RF spectra (measured with 100 Hz RBW) of mode-locking operation with a ReS1.02Se0.98 SA at the pump power of 530 mW. (c) Optical spectrum with the bandwidth of 4.85 nm. (d) Autocorrelation trace for output pulse with a pulse duration of 888 fs with sech2 fit.