title: Heterodyne multi-wavelength absolute interferometry based on a cavity-enhanced electro-optic frequency comb pair.
abstract: We present a heterodyne absolute distance interferometer with a macroscopic range, based on a promising optical source. The basis of the heterodyne measurement principle, a frequency comb pair with slightly different repetition rates and offset frequencies, is realized coherently by synchronized cavity-enhanced electro-optic frequency comb generators. The unknown distance is determined absolutely from the interferometric phases of distinct comb modes, by a parallel digital lock-in scheme. Comparison experiments with a reference HeNe incremental interferometer show an agreement well within 15 μm, for a range up to 10 m.
authors.forename: Ruitao
authors.initials: R
authors.lastname: Yang
authors.forename: Florian
authors.initials: F
authors.lastname: Pollinger
authors.forename: Karl
authors.initials: K
authors.lastname: Meiners-Hagen
authors.forename: Jiubin
authors.initials: J
authors.lastname: Tan
authors.forename: Harald
authors.initials: H
authors.lastname: Bosse