Abstract

A high beam quality diode-pumped Nd:YAG master oscillator power-amplifier (MOPA) laser with three end-pumped slab amplifiers is developed. The ${Q}$-swtiched side-pumped rod oscillator presented a pulse energy 3.1 mJ with beam quality factors of ${\rm M}_{\rm x}^2 = {1.17}$ and ${{\rm M}^2_{\rm y}} = {1.15}$ at a repetition of 1 kHz. The MOPA system delivered a pulse energy of 1.36 J with a pulse width of 48.2 ns and an extraction efficiency of 44.8%. The beam quality factors of ${\rm M}_{\rm x}^2 = {1.72}$ and ${{\rm M}^2_{\rm y}} = {3.85}$ are measured without any phase-conjugators or adaptive optics.

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