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Optimized multilayer dielectric mirror coatings for gravitational wave interferometers

Agresti, Juri and Castaldi, Giuseppe and DeSalvo, Riccardo and Galdi, Vincenzo and Pierro, Vincenzo and Pinto, Innocenzo M. (2006) Optimized multilayer dielectric mirror coatings for gravitational wave interferometers. In: Advances in Thin-Film Coatings for Optical Applications III. Proceedings of SPIE. No.6286. Society of Photo-Optical Instrumentation Engineers (SPIE) , Bellingham, WA, Art. No. 628608. ISBN 9780819463654.

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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.

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Additional Information:© 2006 Society of Photo-Optical Instrumentation Engineers (SPIE). This work has been performed within the frame of a MOU with the LIGO Scientific Collaboration (LSC), and has been sponsored in part by the Italian National Institute for Nuclear Physics (INFN, Gruppo V) through the COAT project. The work of J.A. and R.DS. was supported by the National Science Foundation under Grant No. PHY-0107417.
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Istituto Nazionale di Fisica Nucleare (INFN)UNSPECIFIED
Subject Keywords:Multilayer coatings, dielectric mirrors, gravitational waves, interferometers, thermal noise
Series Name:Proceedings of SPIE
Issue or Number:6286
Record Number:CaltechAUTHORS:20190710-152530987
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Official Citation:Juri Agresti, Giuseppe Castaldi, Riccardo DeSalvo, Vincenzo Galdi, Vincenzo Pierro, and Innocenzo M. Pinto "Optimized multilayer dielectric mirror coatings for gravitational wave interferometers", Proc. SPIE 6286, Advances in Thin-Film Coatings for Optical Applications III, 628608 (28 August 2006);
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:97039
Deposited By: Tony Diaz
Deposited On:10 Jul 2019 22:34
Last Modified:16 Nov 2021 17:25

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