High-Performance Mid-Infrared Crystalline Bragg Mirrors at 4.5 µm

• DOI: 10.1364/assl.2019.atu4a.7
• Publication Date: 2019-10-24T21:13:01Z
• Authors: Georg Winkler; Lukas W. Perner; Gar-Wing Truong; Dominic Bachmann; Aline S. Mayer; Jakob Fellinger; Tobias Zederbauer; David Follman; Christoph Deutsch; Gang Zhao; D. Michelle Bailey; Adam J. Fleisher; Garrett D. Cole; Oliver H. Heckl
• Keywords: 103020 Surface physics; 103011 Halbleiterphysik; 103016 Laser physics; 103021 Optics; 0103 physical sciences; 103021 Optik; 103020 Oberflächenphysik; 103016 Laserphysik; 01 natural sciences; 7. Clean energy; 103011 Semiconductor physics

We present state-of-the-art mid-infrared high-reflectivity low-loss mirrors at 4.54 µm based on substrate-transferred crystalline coatings. Transmission losses of ~145 ppm and excess <50 are demonstrated via cavity-ringdown, direct transmission, photothermal measurements.