M.Lintz, Laser ranging OHP Colloq.23-27/09/ work on absolute laser ranging of long distances at laboratoire ARTEMIS two posters: µm scale accuracy, simple set-up nm scale accuracy, less simple set-up... Laboratoire ARTEMIS, Univ. de Nice, Observatoire de la Côte d'Azur, and CNRS Bd de l'observatoire, Nice

M.Lintz, Télémétrie Laser Atelier Télescopes NG 27-28/03/ "laser" ranging with a broadband source: distance measurement at the µm precision level using high frequency modulation of a light beam Clément Courde, Alain Brillet, Michel Lintz Laboratoire ARTEMIS, Univ. de Nice, Obs. Côte d'Azur, and CNRS Bd de l'observatoire, Nice

M.Lintz, Télémétrie Laser Atelier Télescopes NG 27-28/03/ high frequency modulated laser source Laser ranging with polarisation addressing PBS  aaaa  = c/F "synthetic wavelength" polarisation controller high frequency photodiodes Systematics: electrical crosstalks polarisation crosstalk => stray interference optical return from photodiodes other stray interference several µm >10 µm 1 µm 5 µm phase ideal phase systematic ²² ! 44 wideband !  = 0 reference measurement µwave signals in the complex plane 20mm for 15GHz phase measurement

M.Lintz, Télémétrie Laser Atelier Télescopes NG 27-28/03/ nm with broadband source "Laser" ranging with broadband source stability of the measurement ( with fixed target) 1µm 100nm 10nm

M.Lintz, Télémétrie Laser Atelier Télescopes NG 27-28/03/ Laser ranging at the nm precision level: The two mode interference measurement in the Iliade rangemeter Duy-Hà Phung, Clément Courde, Michel Lintz Laboratoire ARTEMIS, OCA Nice Christophe Alexandre Laboratoire CEDRIC-LETITIA, CNAM, Paris

M.Lintz, Télémétrie Laser Atelier Télescopes NG 27-28/03/ 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 Iliade: combination of three length scales   long-term phase drifts in microwave components >> cycle! same signal collab. Etienne Samain, GéoAzur, OCA Stéphane Pitois, ICB, Univ. Dijon

M.Lintz, Télémétrie Laser Atelier Télescopes NG 27-28/03/ Iliade: optical- and synthetic-length scales in one signal phase meas. ² ² 44 interf. 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 improves as 1/   expected accuracy: nm L - scan complex plane plot of the signal microwave opt.-beat-note

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