Ultra-Violet Laser Damage In Aluminium Mirrors

Stephen S. Wiseall; David C. Emmony

doi:10.1117/12.935528

28 November 1983 Ultra-Violet Laser Damage In Aluminium Mirrors

Stephen S. Wiseall, David C. Emmony

Proceedings Volume 0401, Thin Film Technologies I; (1983) https://doi.org/10.1117/12.935528
Event: 1983 International Technical Conference/Europe, 1983, Geneva, Switzerland

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, MgF₂and 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.

Citation Download Citation

Stephen S. Wiseall and David C. Emmony "Ultra-Violet Laser Damage In Aluminium Mirrors", Proc. SPIE 0401, Thin Film Technologies I, (28 November 1983); https://doi.org/10.1117/12.935528

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