High Power and Contamination Properties of All-Silica High Reflectivity Multilayers

Phyo Lin, Merlin Mah, Joseph Randi, Sage Defrances, David Bernot, Joseph J. Talghader

Research output: Contribution to journalArticlepeer-review

Abstract

Optical multilayers created from a single material have been demonstrated to have lower stress and lower thermal expansion mismatch than standard two-material coatings; however, questions of high power operation and vulnerability to environmental contamination remain. This study examines the particle-induced laser damage properties of all-silica high reflectivity multilayers, specifically those for high average power illumination. All-silica infrared reflectors were deposited by oblique angle deposition (OAD). All-silica mirrors showed low overall stress and had smaller stress changes with temperature. Their laser-induced damage thresholds (LIDTs) under high-power continuous wave (CW) laser illumination with carbon particulate contamination are significantly higher than corresponding high reflectivity multilayers composed of two materials.

Original languageEnglish (US)
JournalIEEE Photonics Journal
DOIs
StateAccepted/In press - 2021

Bibliographical note

Publisher Copyright:
CCBY

Keywords

  • Coatings
  • Films
  • High-energy laser optics
  • laser-induced damage
  • mirrors
  • multilayers
  • Nonhomogeneous media
  • optical thin films
  • particle contamination
  • Pollution measurement
  • Reflectivity
  • Silicon compounds
  • Stress

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