Fig. 1. Schematic of MOPA nanosecond pulsed laser with split pumping configuration with pump wavelength versus temperature and pump pulse energy versus drive current shown by two insets and polarization directions of laser through amplifier twice shown by arrows

Fig. 2. Laser output characteristics of master oscillation stage under different output coupling mirror transmittances. (a) Laser pulse energy versus pump pulse energy; (b) laser pulse energy and corresponding pulse width with pump pulse energy of 10.6 mJ

Fig. 3. Output single pulse energy and conversion efficiency versus pump pulse energy of end-pumped Nd∶YAG amplifier with beam profiles measured by CCD shown in inset. (a) Single-pass amplifier; (b) double-pass amplifier

Fig. 4. Output characteristics of frequency doubled MOPA laser system in LBO crystal. (a) 532 nm laser pulse energy and conversion efficiency versus 1064 nm laser pulse energy with schematic of frequency doubling scheme shown in inset; (b) temporal pulse waveforms of master oscillator seeding laser, double-pass amplified laser, and frequency doubled 532 nm laser

Fig. 5. Beam quality of MOPA laser system. (a) Master oscillator; (b) amplifier

Fig. 6. Output power stability, temporal pulse characteristics and spectral characteristics of MOPA laser system. (a) Average power fluctuation of master oscillator seeding laser, double-pass amplified laser and 532 nm frequency doubling laser; (b) pulse timing jitter of MOPA laser system; (c) pulse sequence when repetition rate is 1 kHz; (d) output spectrum