LLE (Laboratory for Laser Energetics, University of Rochester) Review. Volume 25. Quarterly Report, October-December 1985

摘要

This volume of the LLE Review comprises reports on the performance of the active-mirror-boosted glass 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 the National Laser Users Facility activities for October-December 1985. The following are some highlights of the work described in this issue: (1) The active-mirror booster stage on GDL brings single-beam, 1054-nm output energy near the kilojoule level for 1-ns pulses. (2) 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. (3) Comparison of experimental data and predictions of one-dimensional numerical simulations of OMEGA implosion experiments reveal discrepancies that can be resolved to two-dimensional calculations. (4) The technique of pulse chirping allows temporal stretching and recompression operations to be carried out in picosecond pulses, to amplify pulses in compact systems and avoid the dangers of optical nonlinearities due to high peak powers. (5) High-average-power glass lasers require glasses with improved thermal-shock resistance. Recent gains in ion-exchange surface treatments of a phosphate-composition glass have led to a fivefold increase in thermal-shock resistance for that glass. (ERA citation 11:025151)