Fig. 1. Preparation process of the SnS2-PVA film-type SAs.

Fig. 2. (a) SEM image of the SnS2 nanosheet. (b) EDX spectroscopy of the SnS2 nanosheet. Inset of (b): surface distribution of elements.

Fig. 3. (a) TEM image of the SnS2 nanosheets. (b) Selected-area electron diffraction.

Fig. 4. (a) X-ray diffraction of the SnS2 nanosheets. (b) Raman spectrum of the SnS2 nanosheets.

Fig. 5. (a) Experimental setup of the Z-scan testing platform. (b) Open-aperture Z-scan curves of the SnS2-PVA film.

Fig. 6. (a) Linear transmission of the SnS2-PVA film versus wavelength. (b) Nonlinear absorption property of the SnS2-PVA film.

Fig. 7. Experimental setup of the mode-locked fiber laser.

Fig. 8. (a) Emission spectrum. (b) Autocorrelation trace.

Fig. 9. (a) Relationships between the average output power and pump power. (b) Pulse train of the mode-locked operation. (c) Radio frequency (RF) spectrum of the mode-locked laser located at 29.33 MHz. (d) RF spectrum with a bandwidth of 300 MHz.

Fig. 10. (a) Emission spectra at different times. (b) Central wavelengths and spectrum widths at different times.