Author Affiliations

Z. Xu,^# L. X. Zheng,^# P. M. Fauchet,^# G. W. Wicks,^#,* M. J. Shaw,^#,† M. Jaros,^#,† B. A. Richman,^#,‡ C. A. Rella,^#,‡ and H. A. Schwettman^#,‡

^#Department of Electrical Engineering, University of Rochester, Rochester, New York 14627

^*The Institute of Optics, University of Rochester, Rochester, New York 14627

^†Physics Department, Newcastle University, Newcastle upon Tyne, U.K.

^‡W. W. Hansen Experimental Physics Laboratory, Stanford University, Stanford, California 94305