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 1 Helia Photonics Ltd., Livingston EH54 7EJ, UK 2 E. L. Ginzton Laboratory, Stanford University, Stanford, CA 94305, USA; [email protected] (A.M.); [email protected] (M.M.F.) 3 Scottish Universities Physics Alliance, School of Physics and Astronomy, University of Glasgow, Glasgow G12 8QQ, UK; [email protected] (I.W.M.); [email protected] (P.G.M.); [email protected] (S.R.) 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; [email protected] * Correspondence: [email protected] (C.C.); [email protected] (R.B.); Tel.: +44-150-641-4800 (C.C.)