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Proceedings Paper

Beam control and power conditioning of GEKKO glass laser system
Author(s): Masahiro Nakatsuka; Takahisa Jitsuno; Tadashi Kanabe; Shinji Urushihara; Noriaki Miyanaga; Sadao Nakai
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Paper Abstract

The glass laser fusion driver, GEKKO 12 beam system, at ILE, Osaka, has operated since 1983 to deliver 20 kJ output in 1 ns pulse with the second and third harmonic frequency converters and the pulse tailoring optics. The uniform irradiation of the spherical target in the implosion experiments is a key issue to get the higher density of final compressed core. The pulse power to drive 2000 flash lamps exciting the rod and disk amplifiers is a moderate system with the total energy of 21 MJ in 300 microsecond(s) duration. High reliability and reproducibility are required to keep the laser energy balance of 12 beams within 3%, and no misfiring of 88 high-voltage switches of the laser amplifiers and 14 Pockels optical switches with the total probability of less than 0.1% per shot. Power balance technology involves not only the power conditioning of the flash power supply but also the gain control of the amplifiers and the alignment of a phase angle of the frequency converters, both working very nonlinearly. The precise control is sustained by the precise measurements of the beam energies, power waveforms, and the optical components characteristics such as reflectivity and transmittance. This report includes the optical beam control to realize the uniform illumination with an incoherent light source and the optical phase control in a focusing optics.

Paper Details

Date Published: 1 April 1991
PDF: 8 pages
Proc. SPIE 1411, Pulse Power for Lasers III, (1 April 1991); doi: 10.1117/12.43624
Show Author Affiliations
Masahiro Nakatsuka, Osaka Univ. (Japan)
Takahisa Jitsuno, Osaka Univ. (Japan)
Tadashi Kanabe, Osaka Univ. (Japan)
Shinji Urushihara, Osaka Univ. (Japan)
Noriaki Miyanaga, Osaka Univ. (Japan)
Sadao Nakai, Osaka Univ. (Japan)

Published in SPIE Proceedings Vol. 1411:
Pulse Power for Lasers III
G. Glen McDuff, Editor(s)

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