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Two-Dimensional Multi-Lens Array with Circular Aperture Spherical Lens for Flat-Top Irradiation of Inertial Confinement Fusion Target |
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| Authors: | Noriaki Nishi Takahisa Jitsuno Koji Tsubakimoto Shinichi Matsuoka Noriaki Miyanaga Masahiro Nakatsuka |
| Affiliation: | (1) Institute of Laser Engineering, Osaka University, 2-6, Yamada-oka, Suita, Osaka, Japan;(2) Present address: Usho Optical Systems Co., Ltd., 4-19, Kitazono-cyo, Takatsuki, Osaka 569-0802, Japan |
| Abstract: | A two-dimensional multi-lens array 350 mm in diameter with spherical element lenses has been tested to improve the irradiation uniformity of a high power glass laser for inertial confinement fusion (ICF). A circular shape for the element lens aperture is chosen to eliminate azimuthally asymmetric intensity distribution. An approximate flat-top intensity distribution is obtained with a lens array of 37 lenses. Beam patterns of a coherent laser and partially coherent light (PCL) with the random phase plate (RPP) and the multi-lens array (MLA) are measured in a GEKKO XII glass laser system. Spherical mode structure of the irradiation nonuniformity of 5.6% with MLA is estimated with cos3 θ distribution of absorption coefficient in the target plasma. |
| Keywords: | multi-lens array circular aperture irradiation nonuniformity low-mode flat-top |
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