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Interferometric measurements beyond the coherence length of the laser source
Auteur(s)
Salvadé, Yves
Przygodda, Frank
Rohner, Marcel
Meyer, Yves
Gloriot, Olivier
Llera, Miguel
Polster, Albert
Date de parution
2016-9-19
In
Optics Express
Vol.
19
No
24
De la page
21729
A la page
21743
Résumé
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 rate is sufficiently short to prevent any phase unwrapping error. We could verify experimentally this concept using a miniature interferometer prototype, based on a frequency stabilized vertical cavity surface emitting laser. Displacement measurements at optical path differences up to 36 m could be realized with a relative stability better than 0.1 ppm, although the coherence length estimated from the linewidth and frequency noise measurements do not exceed 6.6 m.
Identifiants
Type de publication
journal article
