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Garrett D. Cole
Crystalline Mirror Solutions LLC
Crystalline Coatings: minimizing Brownian noise
in precision interferometry
Ultrastable optical interferometers require mirrors that simultaneously exhibit excellent optical and mechanical quality. The current bounds of stability and sensitivity in these systems are dictated by the mechanical damping, and thus the corresponding Brownian noise level, of the high-reflectivity coatings that comprise the cavity end mirrors. A spin-off of fundamental research from the University of Vienna, Crystalline Mirror Solutions has developed a proprietary microfabrication technique that enables the transfer of low-loss single-crystal semiconductor heterostructures onto essentially arbitrary optical surfaces. These "crystalline coatings" exhibit both high reflectivity, as well as minimal mechanical damping, with room temperature loss angles an order of magnitude lower than state-of-the-art ion-beam sputtered dielectric coatings. These excellent optomechanical properties pave the way for the next generation of cavity-stabilized laser systems and interferometric gravitational-wave detectors. Beyond our initial demonstration devices developed for 1064 nm, we have now extended the operating wavelength of our crystalline coatings into the near- and mid-infrared (IR). Here I describe efforts towards realizing parts-per-million levels of optical absorption in semiconductor Bragg mirrors at wavelengths from 1000 to beyond 3700 nm, opening up additional application areas in chemical and trace gas sensing as well as power buildup cavities for the mid IR.
Garrett D. Cole, Co-Founder of Crystalline Mirror Solutions LLC obtained his PhD in Materials Science and Engineering from the University of California, Santa Barbara in 2005. Since completing his doctorate, he has held positions ranging from the first employee of a high-tech startup (Aerius Photonics LLC, now FLIR Electro-Optical Components), to a postdoctoral position at Lawrence Livermore National Laboratory, a Marie Curie Fellow of the Austrian Academy of Sciences, and most recently an assistant professor in the Faculty of Physics at the University of Vienna. Leveraging his expertise in micro- and nanofabrication, tunable vertical-cavity surface-emitting lasers, and cavity optomechanics, Dr. Cole developed the proprietary substrate-transfer process at the heart of Crystalline Mirror Solutions and co-founded the venture in February 2012.
Center for Gravtitational Experiments, School of Physics
Huazhong University of Science and Technology, 1037 Luoyu Road, Whuan, 430074, P. R. China.