[1] Univ Southampton, Optoelect Res Ctr, Southampton SO17 1BJ, Hants, England
[2] OFS Labs, Somerset, NJ 08873 USA
[3] USAF, Res Lab, Directed Energy Directorate, Solid State Lasers Branch, Kirtland AFB, NM 87117 USA
[4] Univ Electrocommun, Inst Laser Sci, Tokyo 1828585, Japan