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Proceedings Paper

Optimized multilayer dielectric mirror coatings for gravitational wave interferometers
Author(s): Juri Agresti; Giuseppe Castaldi; Riccardo DeSalvo; Vincenzo Galdi; Vincenzo Pierro; Innocenzo M. Pinto
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Paper Abstract

The limit sensitivity of interferometric gravitational wave antennas is set by the thermal noise in the dielectric mirror coatings. These are currently made of alternating quarter-wavelength high/low index material layers with low mechanical losses. The quarter-wavelength design yields the maximum reflectivity for a fixed number of layers, but not the lowest noise for a prescribed reflectivity. This motivated our recent investigation of optimal thickness configurations, which guarantee the lowest thermal noise for a targeted reflectivity. This communication provides a compact overview of our results, involving nonperiodic genetically-engineered and truncated periodically-layered configurations. Possible implications for the advanced Laser Interferometer Gravitational wave Observatory (LIGO) are discussed.

Paper Details

Date Published: 28 August 2006
PDF: 10 pages
Proc. SPIE 6286, Advances in Thin-Film Coatings for Optical Applications III, 628608 (28 August 2006); doi: 10.1117/12.678977
Show Author Affiliations
Juri Agresti, California Institute of Technology (United States)
Univ. of Pisa (Italy)
Giuseppe Castaldi, Univ. of Sannio (Italy)
Riccardo DeSalvo, California Institute of Technology (United States)
Vincenzo Galdi, Univ. of Sannio (Italy)
Vincenzo Pierro, Univ. of Sannio (Italy)
Innocenzo M. Pinto, Univ. of Sannio (Italy)

Published in SPIE Proceedings Vol. 6286:
Advances in Thin-Film Coatings for Optical Applications III
Michael J. Ellison, Editor(s)

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