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Proceedings Paper

Evaluation of irradiation uniformity on spherical target using angularly dispersed, partially coherent light in direct-drive laser fusion
Author(s): Kouji Tsubakimoto; Masahiro Nakatsuka; Noriaki Miyanaga; Takahisa Jitsuno; Tadashi Kanabe; Hirohiko Nakano; Sadao Nakai
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Paper Abstract

In order to improve an irradiation uniformity on a spherical target, an amplified spontaneous emission (ASE) with an angular dispersion of spectrum is introduced in Gekko XII laser system. The irradiation nonuniformity was estimated from a measured beam pattern at the equivalent target plane. The ASE light substantially reduces the irradiation nonuniformity (rms value) from 19.7% to 3.8%. We also theoretically analyzed smoothing characteristics of the ASE light, and compared them with the experimental results. The Legendre-mode-dependent reduction rates of irradiation nonuniformities which are determined by the ratio of mode amplitudes with and without introduction of ASE, were very consistent with theoretical predictions.

Paper Details

Date Published: 1 May 1993
PDF: 12 pages
Proc. SPIE 1870, Laser Coherence Control: Technology and Applications, (1 May 1993); doi: 10.1117/12.154484
Show Author Affiliations
Kouji Tsubakimoto, Osaka Univ. (Japan)
Masahiro Nakatsuka, Osaka Univ. (Japan)
Noriaki Miyanaga, Osaka Univ. (Japan)
Takahisa Jitsuno, Osaka Univ. (Japan)
Tadashi Kanabe, Osaka Univ. (Japan)
Hirohiko Nakano, Osaka Univ. (Japan)
Sadao Nakai, Osaka Univ. (Japan)

Published in SPIE Proceedings Vol. 1870:
Laser Coherence Control: Technology and Applications
Howard T. Powell; Terrance J. Kessler, Editor(s)

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