Fig. 1. Experimental setup of MgO: PPLN-OPO pumped by YDFL

Fig. 2. YDFL power after ISO versus third stage LD power with insets show spectrum and beam profile

Fig. 3. Waveforms of YDFL with maximum output power

Fig. 4. (a) Mid-infrared laser power as functions of pump power for different curvature radii of M4 and (b) mid-infrared laser spectrum with power of 9.15 W

Fig. 5. Mid-infrared laser power as functions of pump power for different pump waist diameters

Fig. 6. Waveforms of mid-infrared laser with maximum output power