Repair of a mirror coating on a large optic for high laser damage applications using ion milling and over-coating methods
Abstract
Here, when an optical coating is damaged, deposited incorrectly, or is otherwise unsuitable, the conventional method to restore the optic often entails repolishing the optic surface, which can incur a large cost and long lead time. We propose three alternative options to repolishing, including (i) burying the unsuitable coating under another optical coating, (ii) using ion milling to etch the unsuitable coating completely from the optic surface and then recoating the optic, and (iii) using ion milling to etch through a number of unsuitable layers, leaving the rest of the coating intact, and then recoating the layers that were etched. Repairs were made on test optics with dielectric mirror coatings according to the above three options. The mirror coatings to be repaired were quarter wave stacks of HfO2 and SiO2 layers for high reflection at 1054 nm at 45 deg incidence in P-polarization. One of the coating layers was purposely deposited incorrectly as Hf metal instead of HfO2 to evaluate the ability of each repair method to restore the coating’s high laser-induced damage threshold (LIDT) of 64.0 J/cm2. The repaired coating with the highest resistance to laser-induced damage was achieved using repair method (ii) with an LIDT of 49.0 tomore »
- Authors:
-
- 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:
- 1356302
- Report Number(s):
- SAND-2016-5219J
Journal ID: ISSN 0091-3286; 653055
- Grant/Contract Number:
- AC04-94AL85000
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Optical Engineering
- Additional Journal Information:
- Journal Volume: 56; Journal Issue: 1; Journal ID: ISSN 0091-3286
- Publisher:
- SPIE
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; laser damage; optical coatings; HfO2; SiO2; ion milling; ion etching
Citation Formats
Field, Ella S., Bellum, John C., and Kletecka, Damon E. Repair of a mirror coating on a large optic for high laser damage applications using ion milling and over-coating methods. United States: N. p., 2016.
Web. doi:10.1117/1.OE.56.1.011002.
Field, Ella S., Bellum, John C., & Kletecka, Damon E. Repair of a mirror coating on a large optic for high laser damage applications using ion milling and over-coating methods. United States. https://doi.org/10.1117/1.OE.56.1.011002
Field, Ella S., Bellum, John C., and Kletecka, Damon E. Fri .
"Repair of a mirror coating on a large optic for high laser damage applications using ion milling and over-coating methods". United States. https://doi.org/10.1117/1.OE.56.1.011002. https://www.osti.gov/servlets/purl/1356302.
@article{osti_1356302,
title = {Repair of a mirror coating on a large optic for high laser damage applications using ion milling and over-coating methods},
author = {Field, Ella S. and Bellum, John C. and Kletecka, Damon E.},
abstractNote = {Here, when an optical coating is damaged, deposited incorrectly, or is otherwise unsuitable, the conventional method to restore the optic often entails repolishing the optic surface, which can incur a large cost and long lead time. We propose three alternative options to repolishing, including (i) burying the unsuitable coating under another optical coating, (ii) using ion milling to etch the unsuitable coating completely from the optic surface and then recoating the optic, and (iii) using ion milling to etch through a number of unsuitable layers, leaving the rest of the coating intact, and then recoating the layers that were etched. Repairs were made on test optics with dielectric mirror coatings according to the above three options. The mirror coatings to be repaired were quarter wave stacks of HfO2 and SiO2 layers for high reflection at 1054 nm at 45 deg incidence in P-polarization. One of the coating layers was purposely deposited incorrectly as Hf metal instead of HfO2 to evaluate the ability of each repair method to restore the coating’s high laser-induced damage threshold (LIDT) of 64.0 J/cm2. The repaired coating with the highest resistance to laser-induced damage was achieved using repair method (ii) with an LIDT of 49.0 to 61.0 J/cm2.},
doi = {10.1117/1.OE.56.1.011002},
journal = {Optical Engineering},
number = 1,
volume = 56,
place = {United States},
year = {Fri Jul 08 00:00:00 EDT 2016},
month = {Fri Jul 08 00:00:00 EDT 2016}
}