Fig. 1. Structural diagram of actively Q-switched double-cladding fiber laser

Fig. 2. Performance of intensity modulator

Fig. 3. Pulse temporal characteristics. (a) Output pulse sequences under different pump powers at modulation frequency of 100 kHz;

Fig. 4. Schematic of evolution of rise time during initial signal passes through coupler ring. (a) Evolution process ; (b) physical model of coupler ring

Fig. 5. Output pulse characteristics at modulation frequency of 100 kHz. (a) Pulse width with output power versus pump power shown in inset; (b) output spectrum with signal-to-noise ratio shown in inset