Comparison of Single-Layer and Double-Layer Anti-Reflection Coatings Using Laser-Induced Damage Threshold and Photothermal Common-Path Interferometry
Caspar Clark 1,*, Riccardo Bassiri 2,*, Iain W. Martin 3, Ashot Markosyan 2, Peter G. Murray 3, Des Gibson 4
, Sheila Rowan 3 and Martin M. Fejer 2
, Sheila Rowan 3 and Martin M. Fejer 2
1
Helia Photonics Ltd., Livingston EH54 7EJ, UK
2
E. L. Ginzton Laboratory, Stanford University, Stanford, CA 94305, USA
3
Scottish Universities Physics Alliance, School of Physics and Astronomy, University of Glasgow, Glasgow G12 8QQ, UK
4
Scottish Universities Physics Alliance, Institute of Thin Films, Sensors & Imaging, School of Engineering and Computing, University of the West of Scotland, Paisley PA1 2BE, UK
*
Authors to whom correspondence should be addressed.
Coatings 2016, 6(2), 20; https://doi.org/10.3390/coatings6020020
Received: 29 February 2016 / Revised: 27 April 2016 / Accepted: 4 May 2016 / Published: 10 May 2016
(This article belongs to the Special Issue Recent Advances in Optical Coatings)
Abstract
The dielectric thin-film coating on high-power optical components is often the weakest region and will fail at elevated optical fluences. A comparison of single-layer coatings of ZrO2, LiF, Ta2O5, SiN, and SiO2 along with anti-reflection (AR) coatings optimized at 1064 nm comprised of ZrO2 and Ta2O5 was made, and the results of photothermal common-path interferometry (PCI) and a laser-induced damage threshold (LIDT) are presented here. The coatings were grown by radio frequency (RF) sputtering, pulsed direct-current (DC) sputtering, ion-assisted electron beam evaporation (IAD), and thermal evaporation. Test regimes for LIDT used pulse durations of 9.6 ns at 100 Hz for 1000-on-1 and 1-on-1 regimes at 1064 nm for single-layer and AR coatings, and 20 ns at 20 Hz for a 200-on-1 regime to compare the //ZrO2/SiO2 AR coating. View Full-Text
Figure 1
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Clark, C.; Bassiri, R.; Martin, I.W.; Markosyan, A.; Murray, P.G.; Gibson, D.; Rowan, S.; Fejer, M.M. Comparison of Single-Layer and Double-Layer Anti-Reflection Coatings Using Laser-Induced Damage Threshold and Photothermal Common-Path Interferometry. Coatings 2016, 6, 20.
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