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A high infrared-to-green conversion efficiency laser is demonstrated by extra-cavity frequency-doubling of a master oscillator power amplifier (MOPA) laser. The oscillator is a diode-side-pumped acousto-optic Q-switched Nd:YAG laser at 1064 nm with an average output power of 38.2 W and a beam quality factor  M 2   &#x003D; 1.15, operating at a 2 kHz repetition rate and a 38.3 ns pulse duration. After a dual-rod double-pass amplifier, the fundamental seed power is amplified to 89.4 W with the beam quality of  M 2   &#x003D; 1.41 and pulse duration of 56.4 ns. Using a type &#x2160; lithium triborate (LiB 3 O 5 , LBO) crystal for second-harmonic generation (SHG), an average power of 67.4 W at 532 nm is generated with a beam quality factor of 1.31, operating at 41.8 ns of pulse duration. The corresponding frequency doubling efficiency is as high as 75.4&#x0025;, which is, to the best of our knowledge, the highest doubling efficiency reported ever for 532 nm source by an extra-cavity SHG laser system.

High-efficiency nanosecond green laser based on extra-cavity second-harmonic generation of a Nd:YAG MOPA system