Hosted By: Thin Films Technical Group
5 November 2019, 9:30 - 10:30
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Substrate-transferred crystalline coatings are a groundbreaking concept in optical interference coatings. In 2013, fundamental research in optomechanical resonators, “semiconductor supermirrors” demonstrated having the ability to simultaneously achieve ultralow levels of optical and mechanical losses. In this webinar hosted by the OSA Thin Films Technical Group, Garrett Cole of Crystalline Mirror Solutions will provide a discussion on how leveraging semiconductor manufacturing infrastructure, such as epitaxial growth, microfabrication, layer transfer, and direct-bonded GaAs/AlGaAs heterostructures, have reached a level of performance on par with ion-beam sputtered films in the near infrared with scatter + absorption losses < 3 parts per million (ppm) in the wavelength range from 1000-1600 nm. Owing to the single-crystalline microstructure, crystalline coatings exhibit the lowest mechanical loss and highest thermal conductivity (20-30 Wm^-1K^-1) of any supermirror technology. Looking ahead, there is a bright future for crystalline coatings in applications requiring the ultimate levels of optical, thermal, and optomechanical performance, from stabilized lasers for optical atomic clocks, cavity end mirrors for mid-IR enhancement cavities, to robust reflectors for kW-class laser machining systems.
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