title: Propagation of a femtosecond pulse in a microresonator visualized in time.
abstract: A noninvasive pulse-tracking technique has been exploited to observe the time-resolved motion of an ultrashort light pulse within an integrated optical microresonator. We follow a pulse as it completes several round trips in the resonator, directly mapping the resonator modes in space and time. Our time-dependent and phase-sensitive measurement provides direct access to the angular group and phase velocity of the modes in the resonator. From the measurement the coupling constants between the access waveguides and the resonator are retrieved while at the same time the loss mechanisms throughout the structure are directly visualized.
authors.affiliation: Department of Science and Technology and MESA+ Research Institute, University of Twente, P.O. Box 217, 7500 AE Enschede, The Netherlands. h.gersen@tn.utwente.nl
authors.forename: H
authors.initials: H
authors.lastname: Gersen
authors.forename: D J W
authors.initials: DJ
authors.lastname: Klunder
authors.forename: J P
authors.initials: JP
authors.lastname: Korterik
authors.forename: A
authors.initials: A
authors.lastname: Driessen
authors.forename: N F
authors.initials: NF
authors.lastname: van Hulst
authors.forename: L
authors.initials: L
authors.lastname: Kuipers