High-power sub-100-fs UV pulses were generated from a KrF excimer lase
r by spectral control and chirped-pulse amplification. The spectral wi
dth was broadened to 1.6 nm, resulting in 72-fs, nearly transform-limi
ted pulses. The average output powers at 1 kHz were 0.6 and 1.2 W for
pulse widths of 72 and 110 fs, respectively. (C) 1997 Optical Society
of America.