title: Heterodyne beatings between frequency-shifted feedback lasers.
abstract: Frequency-shifted feedback (FSF) lasers are potential candidates for long distance telemetry due to the appearance of beatings in the noise spectrum at the output of a homodyne interferometer: the frequencies of these beatings vary linearly with the path delay. In this Letter we demonstrate that these beatings also occur in the heterodyne mixing of two identical, but distinct, FSF lasers. This phenomenon is explained by the passive cavity model and is exploited to characterize the time-spectrum properties of FSF lasers. Consequences on telemetry with FSF lasers are presented.
authors.affiliation: CNRS/Université Grenoble 1, Laboratoire Interdisciplinaire de Physique, UMR 5588, Grenoble F-38041, France. hguillet@ujf‑grenoble.fr
authors.forename: Hugues Guillet
authors.initials: HG
authors.lastname: de Chatellus
authors.forename: Eric
authors.initials: E
authors.lastname: Lacot
authors.forename: Olivier
authors.initials: O
authors.lastname: Jacquin
authors.forename: Wilfried
authors.initials: W
authors.lastname: Glastre
authors.forename: Olivier
authors.initials: O
authors.lastname: Hugon