Engineerable compression of ultrashort pulses by use of second-harmonic generation in chirped-period-poled lithium niobate.
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.
Arbore
M A
MA
Galvanauskas
A
A
Harter
D
D
Chou
M H
MH
Fejer
M M
MM