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Three measurements: Optical wavelength (  L mod  opt ) phase measurement

Laser ranging at the nm precision level: The two mode interference measurement in the Iliade rangemeter. Duy-Hà Phung, Clément Courde, Michel Lintz L aboratoire ARTEMIS, OCA Nice Christophe Alexandre Laboratoire CEDRIC-LETITIA, CNAM, Paris michel.lintz@oca.eu.

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Three measurements: Optical wavelength (  L mod  opt ) phase measurement

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  1. Laser ranging at the nm precision level: The two mode interference measurement in the Iliade rangemeter Duy-Hà Phung, Clément Courde, Michel LintzLaboratoire ARTEMIS, OCA NiceChristophe AlexandreLaboratoire CEDRIC-LETITIA, CNAM, Parismichel.lintz@oca.eu

  2. Iliade: combination of three length scales Three measurements: Optical wavelength (L mod opt)phase measurement (highest resolution, < nm) + Synthetic wavelength (L mod )phase measurement at µ-wave frequencies: interm. length scale, to <<10-4 cycle + Time-of-flight measurement same signal  long-term phase drifts in microwave components>> 10-4cycle! collab. Etienne Samain, GéoAzur, OCA Stéphane Pitois, ICB, Univ. Dijon

  3. 4 interf. meas. phase ² Iliade: optical- and synthetic-length scales in one signal microwave opt.-beat-note complex signal (helps identification of systematics) rather complex set-up rather complex procedure difficulties related with AM-to-PM coupling (thermal transients in the measurement photodiode) due to amplitude variations resolution 100pm @150µs, improves as 1/ expected accuracy: nm L - scan complex plane plot of the signal

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