title: Real-time displacement measurement immune from atmospheric parameters using optical frequency combs.
abstract: We propose a direct and real-time displacement measurement using an optical frequency comb, able to compensate optically for index of refraction variations due to atmospheric parameters. This scheme could be useful for applications requiring stringent precision over a long distance in air, a situation where dispersion becomes the main limitation. The key ingredient is the use of a mode-locked laser as a precise source for multi-wavelength interferometry in a homodyne detection scheme. By shaping temporally the local oscillator, one can directly access the desired parameter (distance variation) while being insensitive to fluctuations induced by parameters of the environment such as pressure, temperature, humidity and CO2 content.
authors.affiliation: Laboratoire Kastler Brossel, Université Pierre et Marie Curie-Paris 6, ENS, CNRS, Paris, France.
authors.forename: Pu
authors.initials: P
authors.lastname: Jian
authors.forename: Olivier
authors.initials: O
authors.lastname: Pinel
authors.forename: Claude
authors.initials: C
authors.lastname: Fabre
authors.forename: Brahim
authors.initials: B
authors.lastname: Lamine
authors.forename: Nicolas
authors.initials: N
authors.lastname: Treps
mesh_terms: D001272:Atmosphere / Q000737:chemistry*; D004867:Equipment Design; D007368:Interferometry / Q000295:instrumentation*; D007834:Lasers; D008027:Light; D012542:Scattering, Radiation