High-energy, high-repetition-rate LD side-pumped burst-mode green laser

We present a LD-side-pumped Nd:YAG-based burst-mode green laser system that utilizes an electro-optical (EO) Q-switched oscillator followed by a folded power amplifier design and a second harmonic generator to achieve a compact-footprint (0.36 m 2 ) architecture. The maximum pulse energy of 248 mJ at 1064 nm and 102 mJ at 532 nm was obtained at a pulse repetition rate of 10 kHz and burst duration of 5 ms, corresponding to a second-harmonic conversion efficiency of up to 41%. At a higher repetition rate of 50 kHz, an output of over 40 mJ per pulse at 532 nm, with a pulse width of 11.52 ns and a total burst energy of 10 J, was achieved. To the best of our knowledge, this represents the highest reported LD-pumped burst-mode green laser in terms of pulse energy and pulse repetition rate. • A compact LD-pumped burst-mode MOPA frequency-doubled Nd:YAG laser at 532nm is presented. • 65.9 W output at 1064 nm under 265 W pump power conditions. • 40 mJ pulse energy and 10 J burst energy at 532 nm operated at 50 kHz repetition rate. • A stable and uniform output pulse train at 50 kHz, with the maximum output energy, is achieved.