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Proceedings Paper

Repair of a mirror coating on a large optic for high laser-damage applications using ion milling and over-coating methods
Author(s): Ella S. Field; John C. Bellum; Damon E. Kletecka
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Paper 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° 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 J/cm2. The repaired coating with the highest resistance to laser-induced damage was achieved using repair method (ii) with an LIDT of 49 - 61 J/cm2.

Paper Details

Date Published: 31 October 2014
PDF: 13 pages
Proc. SPIE 9237, Laser-Induced Damage in Optical Materials: 2014, 92371E (31 October 2014); doi: 10.1117/12.2067920
Show Author Affiliations
Ella S. Field, Sandia National Labs. (United States)
John C. Bellum, Sandia National Labs. (United States)
Damon E. Kletecka, Sandia National Labs. (United States)

Published in SPIE Proceedings Vol. 9237:
Laser-Induced Damage in Optical Materials: 2014
Gregory J. Exarhos; Vitaly E. Gruzdev; Joseph A. Menapace; Detlev Ristau; MJ Soileau; Detlev Ristau, Editor(s)

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