Abstract
We demonstrate a diode-pumped master oscillator power amplifier Nd:YAG 1064nm laser with sub-joule-level output energy of 0.43J, high pulse repetition rate of 200Hz, and short pulse duration of 100ps. The 5mJ master oscillator consisted of a 100nJ/100ps Nd:YVO4 microchip laser and end-pumped Nd:YAG regenerative amplifier. The two-pass output amplifier was based on two ∅10×140 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 λ/100, and it provides output beam divergence near 1.5×DL in 100ps 0.43 J×200 Hz of operation mode.
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