Observations of x-ray gain in a laser-produced germanium plasma

摘要

Slab Germanium targets have been irradiated in a line focus geometry with 1 - 3 nsec FWHM, 1.06 $mu@m laser pulses at irradiances of I $LSEQ 10$+13$/ W/cm$+2$/. The effect of varying the risetime of the driving laser pulse on the amplification of 3 - 3 soft x-ray lasing lines is investigated. Results of short pulse (100 psec FWHM) experiments have also shown gain on the same lasing transitions, but at substantially higher irradiances I $GREQ 3 $MUL 10$+13$/ W/cm$+2$/.