Fig. 1. (a) GO solution, (b) the reflective GO SA, and (c) the LB system.

Fig. 2. (a) The scanning electron microscope image of the GO LB films, (b) the atomic force microscope image of the GO films, (c) the thickness of GO films, and (d) the Raman spectrum of the GO LB films.

Fig. 3. Linear optical reflectivity curve of the reflective GO SA.

Fig. 4. Schematic diagram of experiment setup of nonlinear optical absorption measurement.

Fig. 5. Nonlinear optical reflectivity of the reflective GO SA.

Fig. 6. Schematic setup of the passively Q-switched laser with reflective GO SA.

Fig. 7. Average output power of CW and QW versus the pump power.

Fig. 8. Evolutions of the pulse repetition rate and the pulse duration with pump power.

Fig. 9. Pulse trains of Q-switched lasers under different pump powers.

Fig. 10. Single pulse under the pump power of 10.90 W.

Fig. 11. QW spectrum.

Fig. 12. Evolutions of the single pulse energy and the pulse peak power with the pump power.