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Two-mode interference measurement for nanometer accuracy absolute ranging

Ha Phung 1 Christophe Alexandre 2 Michel Lintz 3
1 Télémétrie Laser
ARTEMIS - Astrophysique Relativiste Théories Expériences Métrologie Instrumentation Signaux
2 CEDRIC - LAETITIA - CEDRIC. Traitement du signal et architectures électroniques
CEDRIC - Centre d'études et de recherche en informatique et communications
Abstract : We demonstrate a laser ranging scheme that uses a high-frequency modulated beam to achieve subnanometer precision by the combined use of interferometric and time-of-flight measurements. We first describe how the absolute distance is extracted from a two-mode interference signal. In particular, we show that the signal, which presents both optical and synthetic wavelength scales, allows one to achieve nanometer-scale accuracy, despite the significant long-term phase drifts in the 20 GHz detection chains. We present results obtained with the telemeter implemented for a distance of about four meters, obtained by folding the laser beam path to the target.
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Submitted on : Thursday, December 5, 2013 - 10:11:50 AM
Last modification on : Monday, December 14, 2020 - 3:50:04 PM

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Ha Phung, Christophe Alexandre, Michel Lintz. Two-mode interference measurement for nanometer accuracy absolute ranging. Optics Letters, Optical Society of America - OSA Publishing, 2013, 38 (3), pp.281. ⟨10.1364/OL.38.000281⟩. ⟨hal-00914225⟩



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