title: Visible pulse compression to 4 fs by optical parametric amplification and programmable dispersion control.
abstract: Angular dispersion of pump frequencies is shown to be an efficient mechanism for bandwidth enhancement in a noncollinear optical parametric amplifier. We demonstrate the generation of a continuous, simultaneously phase-matched 250-THz parametrically amplified spectrum. The resultant visible-near-IR signal-wave pulses were compressed to a 4-fs duration by a micromachined flexible mirror. Feedback for an iterative computer-controlled dispersion compensation algorithm is based on pulse characterization by second-harmonic generation frequency-resolved optical gating.
authors.forename: Andrius
authors.initials: A
authors.lastname: Baltuska
authors.forename: Takao
authors.initials: T
authors.lastname: Fuji
authors.forename: Takayoshi
authors.initials: T
authors.lastname: Kobayashi