title: Quasi-parabolic pulses in a coherent nonlinear optical amplifier.
abstract: We show that, in a coherent two-level optical amplifier with Kerr nonlinearity and linear loss, any weak seed pulse evolves into a fixed powerful linearly chirped pulse with quasi-parabolic shape. This process is associated with a transition from the incoherent into the coherent amplification regime, thus enabling in practice the generation of pulses with a spectrum wider than the linear gain bandwidth.
authors.affiliation: St.-Petersburg Univerisity, Department of Physics, Petrodvoretz, St.-Petersburg 198504 Russia. victor.kozlov@email.com
authors.forename: Victor V
authors.initials: VV
authors.lastname: Kozlov
authors.forename: Stefan
authors.initials: S
authors.lastname: Wabnitz