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Proceedings Paper

Long-time operation of a 100-W green average-power two-rod double-pass Nd:YAG MOPA system
Author(s): Shuhei Yamamoto; Yasuharu Koyata; Nicolaie Pavel; Yoshihito Hirano
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Paper Abstract

A diode pumped Nd:YAG rod master-oscillator power-amplifier system that delivers 220 W average power in a near top-hat beam distribution has been developed. The repetition rate is 2.5 kHz (25% duty cycle) and the pulse width is approximately 50 ns. With a two-stage KTP crystal 131 W green average power was obtained at frequency-conversion efficiency as high as 65.2%. The system was continuously operated 100 hours starting with an initial green power of 106 W. As the experiments finished the green power was 97.4 W. The decrease in green power, which was mainly attributed to the gray tracing effect in KTP, was characterized by a slope of 0.07-%/hour. The amplifier heads incorporate new concepts for both the pump cavity and the pump source to cavity transport line. Thereby the results of which were an efficient absorption of the pumped light in the media and homogeneous pumped-beam distribution under various pump-power levels, Nd:YAG active media of different radii and concentration and shifts of the diode wavelength resulted.

Paper Details

Date Published: 3 April 2000
PDF: 9 pages
Proc. SPIE 3889, Advanced High-Power Lasers, (3 April 2000); doi: 10.1117/12.380895
Show Author Affiliations
Shuhei Yamamoto, Mitsubishi Electric Corp. (Japan)
Yasuharu Koyata, Mitsubishi Electric Corp. (Japan)
Nicolaie Pavel, Mitsubishi Electric Corp. (Japan)
Yoshihito Hirano, Mitsubishi Electric Corp. (Japan)

Published in SPIE Proceedings Vol. 3889:
Advanced High-Power Lasers
Marek Osinski; Howard T. Powell; Koichi Toyoda, Editor(s)

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