1. Osaka University, Institute of Laser Engineering, 2-6, Yamada-oka, Suita, Osaka 5650871, Japan
2. University of Rochester, Laboratory for Laser Energetics, 250 East River Road, Rochester, New York 14623-1299
3. General Atomics, P.O. Box 85608, San Diego, California 92186-560
4. Gifu University, Department of Electric and Electronic Engineering, 1-1 Yanagido, Gifu 501-1193, Japan