Fig. 1. Experimental setup for generating the pulse width stretched 532 nm Nd∶YAG green laser based on MPC technology, in which the upper right diagram shows the beam spot pattern on mirrors M4 and M5

Fig. 2. Extended cavity length ΔL introduced by MPC flat concave cavity versus m and n

Fig. 3. Output power at 1064 nm versus pump power with MPC (solid squares) and without MPC (solid circles)

Fig. 4. Variation of the pulse width at 1064 nm with the pump power at 808 nm with MPC (solid squares) and without MPC (solid circles) and the corresponding fit for the experimental data

Fig. 5. Pulse width in a Q-switch laser versus cavity length under the maximum pump power

Fig. 6. Output power at 532 nm and SHG efficiency versus input power at 1064 nm, in which the solid squares and solid circles represent the experimental data for the cavity with MPC and without MPC, and the inset is measured spectrum of the 532 nm laser at the maximum output power

Fig. 7. Experimental and theoretical pulse width of 532 nm laser versus input power at 1064 nm, in which the crosses are the measured data, the solid squares and solid circles are the corresponding calculated results with MPC and without MPC, respectively, the dashed lines represent the corresponding fit for the calculated results, and the insets show typical pulse waveforms corresponding to the points indicated by adjacent arrows

Fig. 8. Typical pulse sequence from 532 nm laser operating with MPC at the output power of 6.5 W, in which the inset is 2D spatial intensity profile of the output laser at P_out=6.5 W