Regular Article

Characterisation of the waveplate associated to layers in interferential mirrors

¹ LNCMI, CNRS, UT3, UGA, INSA-T, EMFL, F-31400 Toulouse Cedex, France
² Safran Electronics & Defense, Établissement de Montluçon, BP 3247 - 03106 Montluçon, Cedex
³ Université Toulouse III - Paul Sabatier, LNCMI, CNRS, UGA, INSA-T, EMFL, F-31400 Toulouse Cedex, France

^* e-mail: jonathan.agil@lncmi.cnrs.fr

Received: 11 July 2023
Received in final form: 18 September 2023
Accepted: 18 September 2023
Published online: 7 November 2023

Abstract

In this paper, first we present a review of experimental data corresponding to phase retardation per reflection of interferential mirrors. Then, we report our new measurements on both commercial and tailor-made mirrors. To be able to measure the phase retardation as a function of the number of layers, additional pairs of layers are deposited on some of the mirrors. The results obtained with this special set of mirrors allow us to fully characterise the waveplate associated with the additional pairs of layers. We finally implemented a computational study whose results are compared with the experimental ones. Thanks to the additional layers, we have achieved reflectivity never measured before at λ = 1064 nm, with an associated finesse of F = 895 000.