Université de Neuchâtel

Interferometric measurements beyond the coherence length of the laser source

Salvadé, Yves ; Przygodda, Frank ; Rohner, Marcel ; Polster, Albert ; Meyer, Yves ; Monnerat, Serge ; Gloriod, Olivier ; Llera, Miguel ; Matthey, Renaud ; Di Francesco, Joab ; Gruet, Florian ; Mileti, Gaetano

In: Optics Express, 2016, vol. 24, no. 19, p. 21729-21743

Interferometric measurements beyond the coherence length of the laser are investigated theoretically and experimentally in this paper. Thanks to a high-bandwidth detection, high-speed digitizers and a fast digital signal processing, we have demonstrated that the limit of the coherence length can be overcome. Theoretically, the maximal measurable displacement is infinite provided that the sampling...