Optical Absorption in Amorphous TiO<sub>2</sub>-doped GeO<sub>2</sub> Films from Ab-Initio Calculations
ORAL
Abstract
High-performance dielectric mirror coatings are essential components of the Laser Interferometer Gravitational-Wave Observatory (LIGO), which has enabled major advances in gravitational-wave astronomy. To further improve detector sensitivity and expand the observable range of the universe, the next generation of observatories will require advances in several technologies, including mirror coatings with lower Brownian thermal noise (BTN) and reduced optical absorption.
Amorphous TiO₂-doped GeO₂ films are promising candidates for high-performance mirror coatings in next-generation gravitational-wave detectors. In this talk, I will present computational modeling of the atomic and electronic structure of these coatings, with a focus on intrinsic defects that are likely responsible for the observed few parts-per-million–level absorption at 1064 nm.
Amorphous TiO₂-doped GeO₂ films are promising candidates for high-performance mirror coatings in next-generation gravitational-wave detectors. In this talk, I will present computational modeling of the atomic and electronic structure of these coatings, with a focus on intrinsic defects that are likely responsible for the observed few parts-per-million–level absorption at 1064 nm.
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Presenters
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Kiran Prasai
- Kennesaw State University