1077-nm, CW mirror thin film damage competition

Raluca A. Negres, Christopher J. Stolz, Sage B. DeFrances, David M. Bernot, Joseph A. Randi, Jeffrey J. Thomas

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Scopus citations


This year's competition proposed to survey the damage resistance of near-IR high reflectors designed for continuous-wave (CW) laser applications. The requirements for the coatings were a minimum reflection of 99.5% at normal incidence for 1077-nm light. The participants in this effort selected the coating materials, coating design, and deposition method. Samples were damage tested at a single testing facility using a kW fiber laser source capable of delivering up to 10 MW/cm2 peak irradiance on target. A double blind test assured sample and submitter anonymity. The damage performance results, sample rankings, details of the deposition processes, coating materials and substrate cleaning methods are shared. We found that multilayer coatings using tantala or hafnia as high index materials were top performers under CW laser exposure within several coating deposition groups. Namely, dense coatings by ion-beam sputtering (IBS), plasma-enhanced atomic layer deposition (PEALD) and magnetron sputtering (MS) exhibited the lowest absorption & temperature rise upon CW laser irradiation without damage onset up to the maximum power density level available in this study.

Original languageEnglish (US)
Title of host publication54th Annual Laser Damage Symposium Proceedings - Laser-Induced Damage in Optical Materials 2022
EditorsChristopher Wren Carr, Detlev Ristau, Carmen S. Menoni
ISBN (Electronic)9781510656611
StatePublished - 2022
Event54th Annual Laser Damage Symposium - Laser-Induced Damage in Optical Materials 2022 - Rochester, United States
Duration: Sep 18 2022Sep 21 2022

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X


Conference54th Annual Laser Damage Symposium - Laser-Induced Damage in Optical Materials 2022
Country/TerritoryUnited States

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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