Author:
Owadano Y.,Okuda I.,Matsumoto Y.,Matsushima I.,Koyama K.,Tomie T.,Yano M.
Abstract
Achieved performance of and the future plan for the ASHURA, a 700-J KrF laser, are described. Nanosecond pulses (3–20 ns) with a bandwidth of 50 cm-1 have been produced by gain switching of a preamplifier. The pulses have been six-time angularly multiplexed and double-pass amplified by two electron-beam-pumped amplifiers. The output from the main amplifier is strongly saturated, and maximum energy of 660 J has been extracted in 90 ns with a stage gain of 40. Focused by an f = 1m spherical lens, maximum power density of 6 × 1014 W/cm2 can be obtained on target. The energy density ratio of prepulse on target has been suppressed below 1/107. The ASHURA is being upgraded by adding a next-stage amplifier that aims at 10-kJ output energy in 270 ns.
Subject
Electrical and Electronic Engineering,Condensed Matter Physics,Atomic and Molecular Physics, and Optics
Cited by
32 articles.
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