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Interferometric measurements beyond the coherence length of the laser source

Auteur(s)
Salvadé, Yves
Przygodda, Frank
Rohner, Marcel
Polster, Albert
Meyer, Yves
Monnerat, Serge
Gloriod, Olivier
Llera, Miguel
Matthey-De-L'Endroit, Renaud 
Institut de physique 
Di Francesco, Joab 
Institut de physique 
Gruet, Florian 
Institut de physique 
Mileti, Gaetano 
Institut de physique 
In
Optics Express, Optical Society of America, 2016/24/19/21729-21743
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
https://libra.unine.ch/handle/123456789/5601
_
10.1364/OE.24.021729
Type de publication
journal article
Dossier(s) à télécharger
 main article: Salvad_Y.-Interferometric_measurements-20161012.pdf (1.51 MB)
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