Manuscript received April 28;
1987;
revised September 21;
1987. This work was supported in part by the United States Air Force Office of Scientific Research under Contract F49620-87-C-0016 to the Ultrafast Optical Electronics Center and by the National Science Foundation under Grant DMR-85-06689. Additional support of laser facilities was provided through the Laser Fusion Feasibility Project at the Laboratory for Laser Energetics of the University of Rochester;
which has the following sponsors: Empire State Electric Energy Research Corporation;
General Electric Company;
New York State Energy Research and Development Authority;
Ontario Hydro;
and University of Rochester;