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Proceedings Paper

Ultra-Violet Laser Damage In Aluminium Mirrors
Author(s): Stephen S. Wiseall; David C. Emmony
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Paper Abstract

Laser induced damage threshold measurements at 248nm have been made on thin film deposited aluminium and dielectric overcoated aluminium mirrors. The damage threshold of the aluminium coatings was 0.2Jcm-2. Three dielectric overcoats have been considered, SiO, MgF2 and ThF4. The damage threshold of the SiO and MgF? overcoated aluminium mirrors was about 0.2 - 0.25Jcm-2. The ThF4 overcoated aluminium mirrors with reflectivities at 248nm comparable to the MgF2 and SiO overcoated aluminium mirrors had damage thresholds of 0.4Jcm-2. The influence of U.V. irradiation on the U.V. reflectivity and stoichiometry of the SiO overcoated aluminium mirrors was also investigated. Improvements in reflectivity of 20% at wavelengths below 250nm were observed.

Paper Details

Date Published: 28 November 1983
PDF: 10 pages
Proc. SPIE 0401, Thin Film Technologies I, (28 November 1983); doi: 10.1117/12.935528
Show Author Affiliations
Stephen S. Wiseall, Loughborough University of Technology (United Kingdom)
David C. Emmony, Loughborough University of Technology (United Kingdom)


Published in SPIE Proceedings Vol. 0401:
Thin Film Technologies I
J. Roland Jacobsson, Editor(s)

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