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21 September 2016 Laser damage comparisons of broad-bandwidth, high-reflection optical coatings containing TiO2, Nb2O5, or Ta2O5 high-index layers
Ella S. Field, John C. Bellum, Damon E. Kletecka
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Optical Engineering, Vol. 56, Issue 1, 011018 (September 2016). https://doi.org/10.1117/1.OE.56.1.011018
Abstract
Broad bandwidth coatings allow angle of incidence flexibility and accommodate spectral shifts due to aging and water absorption. Higher refractive index materials in optical coatings, such as TiO2, Nb2O5, and Ta2O5, can be used to achieve broader bandwidths compared to coatings that contain HfO2 high index layers. We have identified the deposition settings that lead to the highest index, lowest absorption layers of TiO2, Nb2O5, and Ta2O5, via e-beam evaporation using ion-assisted deposition. We paired these high index materials with SiO2 as the low index material to create broad bandwidth high reflection coatings centered at 1054 nm for 45 deg angle of incidence and P polarization. High reflection bandwidths as large as 231 nm were realized. Laser damage tests of these coatings using the ISO 11254 and NIF-MEL protocols are presented, which revealed that the Ta2O5/SiO2 coating exhibits the highest resistance to laser damage, at the expense of lower bandwidth compared to the TiO2/SiO2 and Nb2O5/SiO2 coatings.
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 "Laser damage comparisons of broad-bandwidth, high-reflection optical coatings containing TiO2, Nb2O5, or Ta2O5 high-index layers," Optical Engineering 56(1), 011018 (21 September 2016). https://doi.org/10.1117/1.OE.56.1.011018
Published: 21 September 2016
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Cited by 8 scholarly publications.
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KEYWORDS
Optical coatings
Niobium
Tantalum
Laser induced damage
Hybrid fiber optics
Absorption
Laser damage threshold
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