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 LiB<sub>3</sub>O<sub>5</sub> 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 ofAmerica
(140.2010) Lasers and laser optics : Diode laser arrays
(140.3480) Lasers and laser optics : Lasers, diode-pumped
(140.3530) Lasers and laser optics : Lasers, neodymium
(140.3540) Lasers and laser optics : Lasers, Q-switched
(140.4480) Lasers and laser optics : Optical amplifiers
Kazuyoku Tei, Masaaki Kato, Yoshito Niwa, Sayaka Harayama, Yoichiro Maruyama, Tohru Matoba, and Takashi Arisawa, "Diode-pumped 250-W zigzag slab Nd:YAG oscillator amplifier system," Opt. Lett. 23, 514-516 (1998)