Evaluation of irradiation uniformity on spherical target using angularly dispersed, partially coherent light in direct-drive laser fusion

Kouji Tsubakimoto; Masahiro Nakatsuka; Noriaki Miyanaga; Takahisa Jitsuno; Tadashi Kanabe; Hirohiko Nakano; Sadao Nakai

doi:10.1117/12.154484

1 May 1993 Evaluation of irradiation uniformity on spherical target using angularly dispersed, partially coherent light in direct-drive laser fusion

Kouji Tsubakimoto, Masahiro Nakatsuka, Noriaki Miyanaga, Takahisa Jitsuno, Tadashi Kanabe, Hirohiko Nakano, Sadao Nakai

Author Affiliations +

Proceedings Volume 1870, Laser Coherence Control: Technology and Applications; (1993) https://doi.org/10.1117/12.154484
Event: OE/LASE'93: Optics, Electro-Optics, and Laser Applications in Scienceand Engineering, 1993, Los Angeles, CA, United States

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.

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Kouji Tsubakimoto, Masahiro Nakatsuka, Noriaki Miyanaga, Takahisa Jitsuno, Tadashi Kanabe, Hirohiko Nakano, and Sadao Nakai "Evaluation of irradiation uniformity on spherical target using angularly dispersed, partially coherent light in direct-drive laser fusion", Proc. SPIE 1870, Laser Coherence Control: Technology and Applications, (1 May 1993); https://doi.org/10.1117/12.154484

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