1 May 1993 Evaluation of irradiation uniformity on spherical target using angularly dispersed, partially coherent light in direct-drive laser fusion
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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.
© (1993) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Kouji Tsubakimoto, Kouji Tsubakimoto, Masahiro Nakatsuka, Masahiro Nakatsuka, Noriaki Miyanaga, Noriaki Miyanaga, Takahisa Jitsuno, Takahisa Jitsuno, Tadashi Kanabe, Tadashi Kanabe, Hirohiko Nakano, Hirohiko Nakano, Sadao Nakai, 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); doi: 10.1117/12.154484; https://doi.org/10.1117/12.154484
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