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LLE Review Quarterly Report Volume 25 LLE Review Quarterly Report Editor: A. Schrnid (716) 275-3541 October-Decem ber 1985 UR LLE Laboratory for Laser Energetics College of Engineering and Applied Science University of Rochester 250 East River Road Rochester, New York 14623-1299 This report was prepared as an account of work conducted by the Laboratory for Laser Energetics and sponsored by Empire State Electric Energy Research Corporation, General Electric Company, New York State Energy Research and Development Authority, Ontario Hydro, Southern California Edison Company, the University of Rochester, the U.S. Department of Energy, and other United States government agencies. Neither the above named sponsors, nor any of their employees, makes any warranty, expressed or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. Reference herein to any specific commercial product, process, or service by trade name, mark, manufacturer, or otherwise, does not necessarily constitute or imply its endorsement, recommendation, or favoring by the United States Government or any agency thereof or any other sponsor. Results reported in the LLE Review should not be taken as necessarily final results as they represent active research. The views and opinions of authors expressed herein do not necessarily state or reflect those of any of the above sponsoring entities. IN BRIEF This volume of the LLE Review comprises reports on the performance of the active-mirror-boostedglass development laser (GDL) single-beam system; the implementation of multichannel, soft x-ray diagnostic instrumentation; computer simulation of recent OMEGA laser implosion experiments; materials and ultrafast technology developments in the LLE advanced technology program; and the National Laser Users Facility activities for October-December 1985. The following are some highlights of the work described in this issue: The active-mirror booster stage on GDL brings single-beam, 1054-nm output energy near the kilojoule level for 1-ns pulses. Measurements of soft x-ray emission from 100 to 200 eV are now possible with the help of a four-channel, GHz-bandwidth diode spectrometer, which is fully integrated into a digital data acquisition system. Comparison of experimental data and predictions of one- dimensional numerical simulations of OMEGA implosion experiments reveal discrepancies that can be resolved by two-