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Proceedings Paper

Nonlinear spectral shifts in multimode photonic-cystal fibers induced by femtosecond Cr:Forsterite oscillator
Author(s): D. Lorenc; I. Bugar; F. Uherek; A. M. Zheltikov
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Paper Abstract

Intermodally phase-matched third harmonic generation (THG) in a multimode microstructured fiber (PCF) accompanied by nonlinear spectral shifts both for fundamental and for third harmonic (TH) was observed. Femtosecond pulses of a Cr:Forsterite laser oscillator with the central wavelength of 1240 nm were used to excite several PCF samples. This wavelength plays important role for actual optical communication systems being in close proximity to the 1.3 μm window. Depending on the coupling geometry, two different high-order third harmonic fiber modes were observed accompanied by spectral shifts in IR. Instead of broadband radiation as in the IR, isolated peaks were generated in the TH region of the spectrum. By the rotation of input polarization, changes in the THG mode patterns were observed and a detailed analysis revealed the intensity and a polarization effects on the sampled spectra. Observed phenomena are interpreted by numerical calculations of modal dispersion properties for the examined PCF. Simulation results confirm the narrow band multi-peak character of the THG radiation and a good agreement was found between experimental and theoretical peak positions. This work is aimed to extend the knowledge about the spectral control of third harmonic signal by tailoring parameters of the fiber.

Paper Details

Date Published: 12 October 2005
PDF: 8 pages
Proc. SPIE 5950, Photonic Crystals and Fibers, 595013 (12 October 2005);
Show Author Affiliations
D. Lorenc, Comenius Univ. (Slovak Republic)
International Laser Ctr. (Slovak Republic)
I. Bugar, International Laser Ctr. (Slovak Republic)
F. Uherek, International Laser Ctr. (Slovak Republic)
Slovak Univ. of Technology (Slovak Republic)
A. M. Zheltikov, M.V. Lomonosov Moscow State Univ. (Russia)

Published in SPIE Proceedings Vol. 5950:
Photonic Crystals and Fibers
Waclaw Urbanczyk; Bozena Jaskorzynska; Philip St. J. Russell, Editor(s)

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