Optimization of group delay dispersion measurement by Gires–Tournois interferometer

Abstract

In this paper the group delay dispersion (GDD) of some laser mirrors is measured by a Gires–Tournois interferometer (GTI). The GTI is constructed with a partially reflective non-dispersive mirror and a highly reflective dispersive mirror. The GDD of the dispersive mirrors is calculated by determining the spectral position of the minima in the reflection light of the GTI. The previous GDD measurement equation is modified by introducing a correction coefficient. An appropriate level of accuracy is obtained by optimizing the Gires–Tournois mirror distances in our simple and inexpensive practical setup.