title: Phase-only synthesis of ultrafast stretched square pulses.
abstract: We report the generation of square temporal-shape pulses with no loss of spectral bandwidth, using an analytic expression for the spectral phase modulation dependent only on the input spectrum and stretching factor. We demonstrate numerically and experimentally conversion of 40fs pulses into 150 times longer flat top pulses with sharp on and off fronts. Applications in pulse amplification and free electron lasers are considered.
authors.forename: Vadim V
authors.initials: VV
authors.lastname: Lozovoy
authors.forename: Gennady
authors.initials: G
authors.lastname: Rasskazov
authors.forename: Anton
authors.initials: A
authors.lastname: Ryabtsev
authors.forename: Marcos
authors.initials: M
authors.lastname: Dantus