Gravitational-wave detectors such as Virgo and the laser interferometric gravitational-wave observatory (LIGO) use a long-baseline Michelson interferometer with Fabry–Perot cavities in the arms to search for gravitational waves. The symmetry between the two Fabry–Perot cavities is crucial to reduce the interferometer’s sensitivity to the laser amplitude and frequency noise. To this purpose, the transmittance of the mirrors in both cavities should be as close as possible. This paper describes the realization and the characterization of the first twin large low-loss mirrors with transmissions differing by less than 0.01%.
© 2011 Optical Society of America
Original Manuscript: December 22, 2010
Revised Manuscript: March 1, 2011
Manuscript Accepted: March 2, 2011
Published: April 28, 2011
Benoît Sassolas, Quentin Benoît, Raffaele Flaminio, Danièle Forest, Janyce Franc, Massimo Galimberti, Aline Lacoudre, Christophe Michel, Jean-Luc Montorio, Nazario Morgado, and Laurent Pinard, "Twin mirrors for laser interferometric gravitational-wave detectors," Appl. Opt. 50, 1894-1899 (2011)