title: Engineerable compression of ultrashort pulses by use of second-harmonic generation in chirped-period-poled lithium niobate.
abstract: We demonstrate the use of an aperiodic quasi-phase-matching (QPM) grating to generate second-harmonic pulses that are stretched or compressed relative to input pulses at the fundamental frequency. We frequency doubled an externally chirped erbium-doped fiber laser generating 17-ps (FWHM) pulses at 1560nm to produce near-transform-limited 110-fs (FWHM) pulses at 780nm by use of a 5-cm-long lithium niobate crystal poled with a QPM grating chirped from an 18.2- to a 19.8-microm period.
authors.forename: M A
authors.initials: MA
authors.lastname: Arbore
authors.forename: A
authors.initials: A
authors.lastname: Galvanauskas
authors.forename: D
authors.initials: D
authors.lastname: Harter
authors.forename: M H
authors.initials: MH
authors.lastname: Chou
authors.forename: M M
authors.initials: MM
authors.lastname: Fejer