Abstract

We demonstrate a diode-pumped master oscillator power amplifier Nd:YAG 1064 nm laser with sub-joule-level output energy of 0.43 J, high pulse repetition rate of 200 Hz, and short pulse duration of 100 ps. The 5 mJ master oscillator consisted of a 100 nJ/100 ps $\mathrm{Nd}\text{:}{\mathrm{YVO}}_4$ microchip laser and end-pumped Nd:YAG regenerative amplifier. The two-pass output amplifier was based on two $\varnothing 10\times 140\mathrm{mm}$ Nd:YAG laser rods. We apply an adaptive compensator with an analyzer based on an astigmatic optical system and a quadrant photodiode to compensate for low-order wave-front non-stationary thermal distortions in a high-energy laser amplifier. The adaptive compensator demonstrates high sensitivity to curvature changes of $\lambda /100$, and it provides output beam divergence near $1.5\times \mathrm{DL}$ in 100 ps $0.43\mathrm{J}\times 200\mathrm{Hz}$ of operation mode.

© 2018 Optical Society of America

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