An Nd:YAG Micro-MOPA, based on a microchip master oscillator and power amplifier system with gain aperture beam cleaning, could generate sub-ns 200 mJ pulses with extremely high brightness of 18 PW/sr·cm [Opt. Express268609 (2018)]. However, the system repetition rate was limited to 10 Hz, due to thermal problems occurring in the main amplifier rod under high-power operation. In this work, we achieved 100 Hz operation with pulse brightness of 11 PW/sr·cm by optical compensation of thermal lensing, which was evaluated through calculations and an experiment.
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