1 kHz, 12 MW, 300 ps microchip oscillator power amplifier system

We report a diode-pumped passively Q-switched (PQS) sub-nanosecond master oscillator power amplifier system. The master oscillator is a PQS Nd:YAG/Cr:YAG monolithic microchip laser, yielding a pulse duration of similar to 300 ps and pulse energy of 33 mu J at repetition frequency of 1 kHz. After passing two stages end pumped Nd:YVO4 amplifier, the pulse energy is boosted to 3.6 mJ and pulse peak power up to 12 MW with excellent stability (root mean square similar to 0.14%) and high beam quality (M (2) < 1.22).