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Opt Lett. 1997 Jan 01;22(1):13-5. doi: 10.1364/ol.22.000013.

Frequency doubling of femtosecond erbium-fiber soliton lasers in periodically poled lithium niobate.

Optics letters

M A Arbore, M M Fejer, M E Fermann, A Hariharan, A Galvanauskas, D Harter

PMID: 18183087 DOI: 10.1364/ol.22.000013

Abstract

We report efficient frequency doubling of passively mode-locked femtosecond erbium-fiber lasers. Quasi-phase-matched second-harmonic generation in periodically poled lithium niobate is used to generate 8.1 mW of 190-fs (FWHM), 90-pJ pulses at 777 nm with a conversion efficiency greater than can be obtained with existing birefringently phase-matched nonlinear materials. A dispersion-compensation-free soliton oscillator generating transform-limited 230-fs (FWHM) pulses at 1554 nm is used as a pump laser.

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