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Proceedings Paper

Theoretical modeling of laser-matter interaction in spatial filter pinholes for high-energy pulsed lasers
Author(s): Florian Bonneau; Patrick Combis
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Paper Abstract

A major concern in Megajoules and NIF laser studies is the spatial filter pinhole closure. The answer to this problem is a new pinhole architecture and suitable materials. The conical pinhole design at LLNL is the best candidate tested on the NIF prototype: Beamlet. We have investigated the material dependence in terms of laser-solid and laser-plasma interaction. We have demonstrated that a proper choice of material delays the plasma build-up to the end of the ICF drive pulse. To model the pre-plasma step, it is necessary to take into account optical and thermal parameters of the material, and processes of transition, fusion and vaporization. Preliminary calculations predicted the observed material dependence.

Paper Details

Date Published: 7 April 1999
PDF: 6 pages
Proc. SPIE 3578, Laser-Induced Damage in Optical Materials: 1998, (7 April 1999); doi: 10.1117/12.344408
Show Author Affiliations
Florian Bonneau, CEA-Bruyeres-le-Chatel (France)
Patrick Combis, CEA-Bruyeres-le-Chatel (France)

Published in SPIE Proceedings Vol. 3578:
Laser-Induced Damage in Optical Materials: 1998
Gregory J. Exarhos; Arthur H. Guenther; Mark R. Kozlowski; Keith L. Lewis; M. J. Soileau, Editor(s)

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