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8 July 2016 Repair of a mirror coating on a large optic for high laser damage applications using ion milling and over-coating methods
Ella S. Field, John C. Bellum, Damon E. Kletecka
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Optical Engineering, Vol. 56, Issue 1, 011002 (July 2016). https://doi.org/10.1117/1.OE.56.1.011002
Abstract
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.
CC BY: © The Authors. Published by SPIE under a Creative Commons Attribution 4.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.
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Ella S. Field, John C. Bellum, and Damon E. Kletecka "Repair of a mirror coating on a large optic for high laser damage applications using ion milling and over-coating methods," Optical Engineering 56(1), 011002 (8 July 2016). https://doi.org/10.1117/1.OE.56.1.011002
Published: 8 July 2016
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Cited by 3 scholarly publications.
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KEYWORDS
Coating
Ions
Etching
Mirrors
Metals
Laser induced damage
Optical coatings
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