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

doi:10.1117/12.2067920

31 October 2014 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

Author Affiliations +

Proceedings Volume 9237, Laser-Induced Damage in Optical Materials: 2014; 92371E (2014) https://doi.org/10.1117/12.2067920
Event: SPIE Laser Damage, 2014, Boulder, Colorado, United States

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.

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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", Proc. SPIE 9237, Laser-Induced Damage in Optical Materials: 2014, 92371E (31 October 2014); https://doi.org/10.1117/12.2067920

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KEYWORDS

Coating

Ions

Etching

Mirrors

Metals

Optical coatings

Laser induced damage

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