18 W pulse-bursts 532 nm picosecond laser system with four equal amplitude and spacing pulses at 1 kHz

Abstract

An average power of 18 W pulse-burst 532 nm picosecond laser was obtained with four pulses in a burst at 1 kHz. A mode-locked laser and beam splitter mirrors were used to obtain seed pulse-bursts, that one single pulse was divided into four pulses and each pulse in bursts can be controlled. The pulses were broadened from 23.5 to 135 ps by single-pass volume Bragg gratings. After Nd:YAG regenerative amplifier and single-pass two Nd:YAG modules amplifier, 31.2 W in 1064 nm was got. The four pulses had equal amplitude and pulse spacing of 800 ps. Then, 18 W in 532 nm was obtained with nonlinear optical materials of LiB3O5 frequency doubling, the beam quality of the M2 factor was 1.24, and the pulse width was 50 ps. It is a very nice way to obtain high-power pulse-burst picosecond laser with equal pulse spacing and amplitude.