Laser megajoule optical components damage threshold measurements with a large-size beamlet laser (Abstract Only)

Anne Fornier; Philippe Feru; B. Pinot; Herve Leplan; G. Leroux; Scott C. Burkhart; Timothy L. Weiland

doi:10.1117/12.344454

7 April 1999 Laser megajoule optical components damage threshold measurements with a large-size beamlet laser (Abstract Only)

Anne Fornier, Philippe Feru, B. Pinot, Herve Leplan, G. Leroux, Scott C. Burkhart, Timothy L. Weiland

Author Affiliations +

Proceedings Volume 3578, Laser-Induced Damage in Optical Materials: 1998; (1999) https://doi.org/10.1117/12.344454
Event: Laser-Induced Damage in Optical Materials: 1998, 1998, Boulder, CO, United States

Abstract

Large components are needed to build up the Laser Megajoule which belongs to the future generation of fusion laser. It is essential to determine the laser damage threshold of full-size components with a large-size laser beam, and to compare this value to the threshold obtained on small samples with a small gaussian laser beam. So, we have, in the first place, tested some small samples from the same coating run on REOSC, CEA and LLNL facilities and, in a second series of experiments, we have tested three full-size optical components on the LLNL beamlet laser. Two types of optical components have been tested on the beamlet: - one polarizer: 710 X 400 nm; - two HfO₂/SiO₂ mirrors, from the same coating run: 620 X 440 mm. Before beamlet irradiation these components have been continued at 10 ns on the LLNL Plato facility. Concerning the mirrors, two different conditioning procedures have been applied: - on the first mirror a 5-step conditioning procedure; - on the second mirror a 2-step conditioning procedure. Then, each mirror has undergone the same test on the beamlet. In this paper we report the result obtained on the polarizer and the mirrors after beamlet irradiation.

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Anne Fornier, Philippe Feru, B. Pinot, Herve Leplan, G. Leroux, Scott C. Burkhart, and Timothy L. Weiland "Laser megajoule optical components damage threshold measurements with a large-size beamlet laser (Abstract Only)", Proc. SPIE 3578, Laser-Induced Damage in Optical Materials: 1998, (7 April 1999); https://doi.org/10.1117/12.344454

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KEYWORDS

Mirrors

Laser damage threshold

Optical components

Laser optics

Coating

Polarizers

Laser welding

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