Optimized multilayer dielectric mirror coatings for gravitational wave interferometers

Juri Agresti; Giuseppe Castaldi; Riccardo DeSalvo; Vincenzo Galdi; Vincenzo Pierro; Innocenzo M. Pinto

doi:10.1117/12.678977

28 August 2006 Optimized multilayer dielectric mirror coatings for gravitational wave interferometers

Juri Agresti, Giuseppe Castaldi, Riccardo DeSalvo, Vincenzo Galdi, Vincenzo Pierro, Innocenzo M. Pinto

Proceedings Volume 6286, Advances in Thin-Film Coatings for Optical Applications III; 628608 (2006) https://doi.org/10.1117/12.678977
Event: SPIE Optics + Photonics, 2006, San Diego, California, United States

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.

Citation Download 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); https://doi.org/10.1117/12.678977

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