Fig. 1. SEM image and FTIR spectra of the MADP film

Fig. 2. Experimental setup for measuring nonlinear absorption characteristics and the transmission curve of MADP-SA

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

Fig. 4. Q-switched pulse trains under different pump power

Fig. 5. Repetition rate and pulse width and output power and single pulse energy versus pump power of the Q-switched operation

Fig. 6. The Q-switched pulse width and the wavelength spectrum of the Q-switched EDF laser at the pump power of 380 mW