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The impact of contamination and aging effects on the long-term laser-damage resistance of SiO2/HfO2/TiO2 high-reflection coatings for 1054nm

Journal Article · · Proceedings of SPIE - The International Society for Optical Engineering
DOI:https://doi.org/10.1117/12.2500279· OSTI ID:1570279
 [1];  [1]
  1. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
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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.
Research Organization:
Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
AC04-94AL85000
OSTI ID:
1570279
Alternate ID(s):
OSTI ID: 1806887
OSTI ID: 1592302
Report Number(s):
SAND--2019-11989J; 680091
Journal Information:
Proceedings of SPIE - The International Society for Optical Engineering, Journal Name: Proceedings of SPIE - The International Society for Optical Engineering Vol. 10805; ISSN 0277-786X
Publisher:
SPIECopyright Statement
Country of Publication:
United States
Language:
English

References (7)

Optical coatings for laser fusion applications journal November 1980
Scaling laws of femtosecond laser pulse induced breakdown in oxide films journal March 2005
Impact of different cleaning processes on the laser damage threshold of antireflection coatings for Z-Backlighter optics at Sandia National Laboratories journal November 2014
Laser damage comparisons of broad-bandwidth, high-reflection optical coatings containing TiO 2 , Nb 2 O 5 , or Ta 2 O 5 high-index layers journal September 2016
Influences of oil-contamination on LIDT and optical properties in dielectric coatings conference December 2012
Reactive ion-assisted deposition of e-beam evaporated titanium for high refractive index TiO 2 layers and laser damage resistant, broad bandwidth, high-reflection coatings journal December 2013
Femtosecond laser damage resistance of oxide and mixture oxide optical coatings journal January 2012

Figures / Tables (6)

Fig. 1(p. 3)figure Fig. 1
Fig. 2(p. 3)figure Fig. 2
Table 1(p. 4)table Table 1
Fig. 3(p. 7)figure Fig. 3
Fig. 4(p. 9)figure Fig. 4
Fig. 5(p. 10)figure Fig. 5

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Related Subjects

42 ENGINEERING
Aging
Contamination
Hafnia
Laser Damage
Mirrors
Optical Coatings
Silica
Titania