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Opt Lett. 1997 Sep 01;22(17):1341-3. doi: 10.1364/ol.22.001341.

Engineerable compression of ultrashort pulses by use of second-harmonic generation in chirped-period-poled lithium niobate.

Optics letters

M A Arbore, A Galvanauskas, D Harter, M H Chou, M M Fejer

PMID: 18188233 DOI: 10.1364/ol.22.001341

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.

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