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Title: The impact of contamination and aging effects on the long-term laser-damage resistance of SiO 2/HfO 2/TiO 2 high-reflection coatings for 1054nm

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 SiO 2 and HfO 2 and/or TiO 2 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. Here, 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.

Authors:
 [1];  [1]
  1. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Publication Date:
Research Org.:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1570279
Report Number(s):
SAND-2019-11989J
680091
Grant/Contract Number:  
AC04-94AL85000
Resource Type:
Accepted Manuscript
Journal Name:
Optical Engineering
Additional Journal Information:
Journal Name: Optical Engineering
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; Optical Coatings; Hafnia; Silica; Titania; Laser Damage; Mirrors; Aging; Contamination

Citation Formats

Field, Ella Suzanne, and Kletecka, Damon E. The impact of contamination and aging effects on the long-term laser-damage resistance of SiO2/HfO2/TiO2 high-reflection coatings for 1054nm. United States: N. p., 2018. Web. doi:10.1117/12.2500279.
Field, Ella Suzanne, & Kletecka, Damon E. The impact of contamination and aging effects on the long-term laser-damage resistance of SiO2/HfO2/TiO2 high-reflection coatings for 1054nm. United States. doi:10.1117/12.2500279.
Field, Ella Suzanne, and Kletecka, Damon E. Fri . "The impact of contamination and aging effects on the long-term laser-damage resistance of SiO2/HfO2/TiO2 high-reflection coatings for 1054nm". United States. doi:10.1117/12.2500279. https://www.osti.gov/servlets/purl/1570279.
@article{osti_1570279,
title = {The impact of contamination and aging effects on the long-term laser-damage resistance of SiO2/HfO2/TiO2 high-reflection coatings for 1054nm},
author = {Field, Ella Suzanne and Kletecka, Damon E.},
abstractNote = {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. Here, 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.},
doi = {10.1117/12.2500279},
journal = {Optical Engineering},
number = ,
volume = ,
place = {United States},
year = {2018},
month = {11}
}

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