Abstract

A laser-diode-pumped zigzag slab Nd:YAG master oscillator power amplifier (MOPA) system featuring high pulse energy and high average power was developed for pumping of an ultrashort-pulse laser system. The MOPA system consists of an oscillator, a preamplifier, two postamplifiers, and image-relay telescopes. The postamplifiers have an angle-multiplexed ring-type double-pass configuration. A pulse energy of 1.26  J and an average power of 251  W were obtained at a repetition rate of 200  Hz. The frequency-doubled power when a LiB3O5 crystal was used was 105  W at a repetition rate of 170  Hz. The intensity profiles of the fundamental and the second harmonic are nearly top-hat shaped and are suitable for pumping.

© 1998 Optical Society of America

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