Interferometric measurement of the temperature dependence of an index of refraction: application to fused silica

Paul-Edouard Dupouy (1) , Matthias Büchner (1) , Philippe Paquier (1) , Gérard Trénec (1) , Jacques Vigué (1, 2)

1 Interférométrie (LCAR)
2 LCAR - Laboratoire Collisions Agrégats Réactivité

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.

Domaines: Physique [physics]

Paul-Edouard Dupouy, Matthias Büchner, Philippe Paquier, Gérard Trénec, Jacques Vigué. Interferometric measurement of the temperature dependence of an index of refraction: application to fused silica. Applied optics, 2010, 49 (4), pp.678-682. ⟨10.1364/AO.49.000678⟩. ⟨hal-00915847⟩