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Performance of the ASHURA KrF laser and its upgrading plan

Published online by Cambridge University Press:  09 March 2009

Y. Owadano ,
I. Okuda ,
Y. Matsumoto ,
I. Matsushima ,
K. Koyama ,
T. Tomie  and
M. Yano
Y. Owadano
Affiliation:
Electrotechnical Laboratory, 1–1–4 Umezono, Tsukuba, Ibaraki 305, Japan
I. Okuda
Affiliation:
Electrotechnical Laboratory, 1–1–4 Umezono, Tsukuba, Ibaraki 305, Japan
Y. Matsumoto
Affiliation:
Electrotechnical Laboratory, 1–1–4 Umezono, Tsukuba, Ibaraki 305, Japan
I. Matsushima
Affiliation:
Electrotechnical Laboratory, 1–1–4 Umezono, Tsukuba, Ibaraki 305, Japan
K. Koyama
Affiliation:
Electrotechnical Laboratory, 1–1–4 Umezono, Tsukuba, Ibaraki 305, Japan
T. Tomie
Affiliation:
Electrotechnical Laboratory, 1–1–4 Umezono, Tsukuba, Ibaraki 305, Japan
M. Yano
Affiliation:
Electrotechnical Laboratory, 1–1–4 Umezono, Tsukuba, Ibaraki 305, Japan
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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.

Type
Research Article
Information
Laser and Particle Beams , Volume 11 , Issue 2 , June 1993 , pp. 347 - 351
Copyright
Copyright © Cambridge University Press 1993

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References

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