Optimized multilayer dielectric mirror coatings for gravitational wave interferometers

被引：28

作者：

Agresti, Juri ^{[1
,2
]}

Castaldi, Giuseppe ^{[3
]}

DeSalvo, Riccardo ^{[1
]}

Galdi, Vincenzo ^{[3
]}

Pierro, Vincenzo ^{[3
]}

Pinto, Innocenzo M. ^{[3
]}

机构：

[1] CALTECH, LIGO Lab, Pasadena, CA 91125 USA

[2] Univ Pisa, Dept Phys, I-56127 Pisa, Italy

[3] Univ Sannio, Dept Engn, Waves Grp, I-82100 Benevento, Italy

来源：

ADVANCES IN THIN - FILM COATINGS FOR OPTICAL APPLICATIONS III | 2006年 / 6286卷

基金：

美国国家科学基金会;

关键词：

multilayer coatings; dielectric mirrors; gravitational waves; interferometers; thermal noise;

D O I：

10.1117/12.678977

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

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.

引用

页数：10

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