Fig. 1. Characterization of ZIS nanoflowers. (a) SEM image at 1 μm scale; (b) SEM image at 200 nm scale; (c) XRD spectrum; (d) absorption spectrum; (e) EPR spectroscopy

Fig. 2. Nonlinear transmission of the ZIS saturable absorber

Fig. 3. Schematic of the 1 μm pulsed laser experimental setup

Fig. 4. Output performance of the passive Q-switched laser. (a) Output power of continuous wave (CW) and pulsed laser; (b) pulse repetition rate frequency and pulse duration of Q-switched laser; (c) single pulse energy and peak power of Q-switched laser

Fig. 5. Shortest pulse at different time scales. (a) Pulse sequence at 20 μs time scale; (b) pulse sequence at 2 μs time scale

Fig. 6. Beam quality factors (insert picture is beam profile)