M. J. Withford, D. J. W. Brown, D. W. Coutts, and J. A. Piper, "Increased efficiency of high-beam-quality extraction from a Cu-vapor laser withH2/NE admixtures,"
in Conference on Lasers and Electro-Optics, T. Baer, A. Smirl, J. Bowers, and D. Miller, eds.,
Vol. 8 of OSA Technical Digest
(Optical Society of America, 1994), paper CFD3.