17–23 oct. 2021
Village La Fayette - La Rochelle
Fuseau horaire Europe/Paris

Characterization of light scattering point defects in high-performance mirrors for gravitational wave detectors

18 oct. 2021, 14:30
23m
Village La Fayette - La Rochelle

Village La Fayette - La Rochelle

Avenue de Bourgogne, 17041 La Rochelle, France http://www.seminaire-conference-la-rochelle.org https://goo.gl/maps/c2X8hqd9maRShkCm8 The centre is located at about 5 km from the La Rochelle train station (Gare de La Rochelle) and at about 5 km from the La Rochelle airport (Aéroport de La Rochelle-Ile de Ré). The organization will provide a shuttle transportation from both the train station and the airport to the site in the evening of the first day, and from the site to the train station and the airport in the morning of the last day.
Instrumentation Instrumentation

Orateur

Sihem Sayah (LMA-IP2I)

Description

The high reflective mirrors of the gravitational waves detector LIGO & Virgo present in the coating many micrometer size defects that scatter the light in the interferometer. This scattered light induces a loss of the laser power of the order of a few tens of parts per million (ppm) and a phase noise because of the recombination with the main beam after reflection on the tube walls. This phenomenon limits the sensitivity of the detector and impacts the ability to detect astrophysical events. A reduction of the scattered light is thus required in order to improve the optical performances of the coatings for the new mirrors of the Advanced LIGO and Virgo plus upgrade. For this purpose we studied the point defects for each material and we analyzed the impact of different parameters in order to compare the density and the size distribution of the defects.

Auteur principal

Sihem Sayah (LMA-IP2I)

Documents de présentation