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报告内容摘要
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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.
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报告人简介
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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.
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