Improvement of laser irradiation uniformity in GEKKO XII glass laser system

Conference · Sun Dec 31 04:00:00 EST 1995

OSTI ID:234185

Miyanaga, Noriaki; Matsuoka, Shinichi; Ando, Akinobu; Amano, Shinji; Nakatsuka, Masahiro; Kanabe, Tadashi; Jitsuno, Takahisa; Nakai, Sadao ^[1]; Tsubakimoto, Kouji ^[2]

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1. Osaka Univ., Suita, Osaka (Japan). Inst. of Laser Engineering
2. Inst. for Laser Technology, Suita, Osaka (Japan)

The uniform laser irradiation is one of key issues in the direct drive laser fusion research. The several key technologies for the uniform laser irradiation are reported. This paper includes the uniformity performance as a result of the introduction of the random phase plate, the partially coherent light and the beam smoothing by spectral dispersion into the New Gekko XI glass laser system. Finally the authors summarize the overall irradiation uniformity on the spherical target surface by considering the power imbalance effect. The technologies developed for the beam smoothing and the power balance control enable them to achieve the irradiation nonuniformities of around 1% level for a foot pulse and of a few % for a main drive pulse, respectively.

• OSTI ID: 234185
• Report Number(s): CONF-9505264--; ISBN 0-8194-1997-4
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
BEAM OPTICS
BEAM PROFILES
BEAM SHAPING
DIRECT DRIVE LASER IMPLOSION
FREQUENCY MODULATION
GEKKO FACILITY
LASER TARGETS
NEODYMIUM LASERS
PERFORMANCE