M.Lintz, Laser ranging OHP Colloq.23-27/09/2013 1 work on absolute laser ranging of long distances at laboratoire ARTEMIS two posters: µm scale accuracy,

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1 M.Lintz, Laser ranging OHP Colloq.23-27/09/2013 1 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 michel.lintz@oca.eu

2 M.Lintz, Télémétrie Laser Atelier Télescopes NG 27-28/03/2012 2 "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 michel.lintz@oca.eu

3 M.Lintz, Télémétrie Laser Atelier Télescopes NG 27-28/03/2012 3 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

4 M.Lintz, Télémétrie Laser Atelier Télescopes NG 27-28/03/2012 4 7nm with broadband source "Laser" ranging with broadband source stability of the measurement ( with fixed target) 1µm 100nm 10nm