title: Single-shot reconstruction of spectral amplitude and phase in a fiber ring cavity at a 80  MHz repetition rate.
abstract: Femtosecond pulses circulating in a synchronously driven fiber ring cavity have complex amplitude and phase profiles that can change completely from one round-trip to the next. We use a recently developed technique, combining dispersive Fourier transformation) with spectral interferometry, to reconstruct the spectral amplitude and phase at each round-trip and, thereby, follow in detail the pulse reorganization that occurs. We focus on two different regimes: a period-two regime in which the pulse alternates between two distinct states and a highly complex regime. We characterize the spectral amplitude and phase of the pulses in both regimes at a repetition rate of 75.6 MHz and find good agreement with modeling of the system based on numerical solutions of the generalized nonlinear Schrödinger equation with feedback.
authors.forename: Jonas
authors.initials: J
authors.lastname: Hammer
authors.forename: P
authors.initials: P
authors.lastname: Hosseini
authors.forename: C R
authors.initials: CR
authors.lastname: Menyuk
authors.forename: Philip
authors.initials: P
authors.lastname: St J Russell
authors.forename: Nicolas Y
authors.initials: NY
authors.lastname: Joly