High power, high repetition rate, picosecond 515 nm laser based on a frequency-doubled, diode-pumped Yb:YAG MOPA

Abstract A high-power, high repetition rate, all-solid-state picosecond laser at 515 nm is demonstrated by extra-cavity frequency-doubling of a master oscillator power amplifier system. After a two-stage amplifier with rod-like Yb:YAG, the 1030 nm seed power is amplified to 121.9 W with a repetition rate of 30 MHz. Employing a type I lithium triborate (LiB 3 O 5 , LBO) crystal for second-harmonic generation, an average power of 61.1 W at 515 nm is obtained, with an M 2 factor of 2.51, corresponding to a conversion efficiency of 50.1% from infrared to green pulse.