Paper
16 November 2018 The impact of contamination and aging effects on the long-term laser-damage resistance of SiO2/HfO2/TiO2 high-reflection coatings for 1054nm
Ella S. Field, Damon E. Kletecka
Author Affiliations +
Abstract
The laser damage thresholds of optical coatings can degrade over time due to a variety of factors, including contamination and aging. Optical coatings deposited using electron beam evaporation are particularly susceptible to degradation due to their porous structure. In a previous study, the laser damage thresholds of optical coatings were reduced by roughly a factor of two from 2013 to 2017. The coatings in question were high reflectors for 1054 nm that contained SiO2 and HfO2 and/or TiO2 layers, and they were stored in sealed PETG containers in a class 100 cleanroom with temperature control. At the time, it was not certain whether contamination or thin film aging effects were responsible for the reduced laser damage thresholds. Therefore, to better understand the role of contamination, the coatings were recleaned and the laser damage thresholds were measured again in 2018. The results indicate that contamination played the most dominant role in reducing the laser damage thresholds of these optical coatings, even though they were stored in an environment that was presumed to be clean.
© (2018) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Ella S. Field and Damon E. Kletecka "The impact of contamination and aging effects on the long-term laser-damage resistance of SiO2/HfO2/TiO2 high-reflection coatings for 1054nm", Proc. SPIE 10805, Laser-Induced Damage in Optical Materials 2018: 50th Anniversary Conference, 108051T (16 November 2018); https://doi.org/10.1117/12.2500279
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KEYWORDS
Contamination

Optical coatings

Mirrors

Laser damage threshold

Laser induced damage

Silica

Electron beams

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