Regular papers

Passive introduction of carrier fringes in real-time photo refractive interferometers for single interferogram analysis

¹ Laboratoire Charles Fabry de l’Institut d’Optique, CNRS, Univ Paris-Sud, Campus Polytechnique, RD128, 91127 Palaiseau cedex, France
² Centre Spatial de Liège, Université de Liège, Parc Scientifique du Start Tilman, Avenue du Pré Aily, Angleur 4031, Belgium
³ Institut für Technische Optik, Universit¨at Stuttgart, Pfaffenwaldring 9, 70569 Stuttgart, Germany

^* gilles.pauliat@institutoptique.fr

Received: 7 September 2006

Abstract

We propose a new technique to introduce carrier fringes in an holographic interferometric set-up for deformation or vibration analyses. This technique makes use of the anisotropic diffraction processes of photorefractive crystals. The main advantage of the proposed technique is that it just involves static components, no moving parts or active components are required. This technique is demonstrated in a real-time interferometric set-up operating at the wavelength of 1.06 µm and with a GaAs photorefractive crystal as the holographic medium.