Interferometric measurement of the temperature dependence of an index of refraction: application to fused silica.
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.
Dupouy
Paul-Edouard
PE
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.
Büchner
Matthias
M
Paquier
Philippe
P
Trénec
Gérard
G
Vigué
Jacques
J