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 1560 nm
to produce near-transform-limited 110-fs (FWHM) pulses at 780 nm
by use of a 5-cm-long lithium niobate crystal poled with a QPM grating chirped
from an 18.2- to a 19.8- period.
© 1997 Optical Society of America
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