Nonlinear spectral shifts in multimode photonic-cystal fibers induced by femtosecond Cr:Forsterite oscillator

D. Lorenc; I. Bugar; F. Uherek; A. M. Zheltikov

doi:10.1117/12.623127

12 October 2005 Nonlinear spectral shifts in multimode photonic-crystal fibers induced by femtosecond Cr:Forsterite oscillator

D. Lorenc, I. Bugar, F. Uherek, A. M. Zheltikov

Author Affiliations +

Proceedings Volume 5950, Photonic Crystals and Fibers; 595013 (2005) https://doi.org/10.1117/12.623127
Event: Congress on Optics and Optoelectronics, 2005, Warsaw, Poland

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.

Citation Download Citation

D. Lorenc, I. Bugar, F. Uherek, and A. M. Zheltikov "Nonlinear spectral shifts in multimode photonic-crystal fibers induced by femtosecond Cr:Forsterite oscillator", Proc. SPIE 5950, Photonic Crystals and Fibers, 595013 (12 October 2005); https://doi.org/10.1117/12.623127

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