28 August 2006 Optimized multilayer dielectric mirror coatings for gravitational wave interferometers
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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.
© (2006) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Juri Agresti, Juri Agresti, Giuseppe Castaldi, Giuseppe Castaldi, Riccardo DeSalvo, Riccardo DeSalvo, Vincenzo Galdi, Vincenzo Galdi, Vincenzo Pierro, Vincenzo Pierro, Innocenzo M. Pinto, 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); doi: 10.1117/12.678977; https://doi.org/10.1117/12.678977


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