title: Interferometric measurement of the temperature dependence of an index of refraction: application to fused silica.
abstract: The light reflected by an uncoated Fabry-Perot etalon presents dark rings which give a very sensitive measurement of the variations of the return optical path in the etalon. By measuring the diameters of these rings as a function of the etalon temperature T, we get a sensitive measurement of the derivative dn/dT of the index of refraction n. We have made this experiment with a fused silica etalon and we have achieved a 2% relative uncertainty on dn/dT, comparable to the uncertainty of the best experiments.
authors.affiliation: Laboratoire Collisions Agrégats Réactivité Institut de Recherche sur les Systèmes Atomiques et Moléculaires Complexes, Université de Toulouse, Université Paul Sabatier and CNRS Unité Mixte de Recherche 5589, F-31062 Toulouse, France.
authors.forename: Paul-Edouard
authors.initials: PE
authors.lastname: Dupouy
authors.forename: Matthias
authors.initials: M
authors.lastname: Büchner
authors.forename: Philippe
authors.initials: P
authors.lastname: Paquier
authors.forename: Gérard
authors.initials: G
authors.lastname: Trénec
authors.forename: Jacques
authors.initials: J
authors.lastname: Vigué