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Nanometer-scale absolute laser ranging: exploiting a two-mode interference signal for high accuracy distance measurements

Ha Phung 1 Clément Courde 2 Christophe Alexandre 3 Michel Lintz 2
1 Télémétrie Laser
ARTEMIS - Astrophysique Relativiste Théories Expériences Métrologie Instrumentation Signaux
3 CEDRIC - LAETITIA - CEDRIC. Traitement du signal et architectures électroniques
CEDRIC - Centre d'études et de recherche en informatique et communications
Abstract : Absolute distance measurement with accuracy below the micron scale is important in astronomical optical interferometry. We present here an absolute laser rangefinder which relies on the detection of a two mode interference signal. We exploit the specific signature of the signal to extract both the interferometric and synthetic phase measurements, leading to distance measurement with nanometric accuracy. A resolution of 100 pm has been achieved in 75 μs with a relatively simple laser source. Amplitude to phase coupling in the detection chains turns out to be the largest source of systematic errors. A specific detection scheme is implemented, using optical demodulation of the microwave optical signal, to reduce amplitude-to-phase related systematic errors to below the required level.
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  • HAL Id : hal-01058879, version 1

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Ha Phung, Clément Courde, Christophe Alexandre, Michel Lintz. Nanometer-scale absolute laser ranging: exploiting a two-mode interference signal for high accuracy distance measurements. OHP2013 colloquium: Improving the performances of current optical interferometers & future designs, Sep 2013, Saint Michel L'Observatoire, France. pp.79-86. ⟨hal-01058879⟩

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