Abstract
In this paper a delicately designed double-passing end-pumped rod amplifier is reported that produces 10.2 W average laser output when seeded by a 6 mW microchip laser at a repetition rate of 70 kHz with pulse duration of 90 ps. A pulse peak power of and pulse energy of is achieved. The beam quality is well preserved by a double-passing configuration for spherical-aberration compensation. The laser-beam size in the amplifier is optimized to prevent the unwanted damage from the high pulse peak-power density. This study provides a simple and robust picosecond all-solid-state master oscillator power amplifier system with both high peak power and high beam quality, which shows great potential in the micromachining.
© 2016 Optical Society of America
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