7 April 1999 Laser megajoule optical components damage threshold measurements with a large-size beamlet laser (Abstract Only)
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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.
© (1999) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Anne Fornier, Anne Fornier, Philippe Feru, Philippe Feru, B. Pinot, B. Pinot, Herve Leplan, Herve Leplan, G. Leroux, G. Leroux, Scott C. Burkhart, Scott C. Burkhart, Timothy L. Weiland, 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); doi: 10.1117/12.344454; https://doi.org/10.1117/12.344454


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