Supercontinuum generation in crystal fibres
Nikola Ivanov Nikolov1,2 and Ole Bang1
1Department of Informatics and Mathematical Modelling
Technical University of Denmark, building 321
DK-2800 Kongens Lyngby, Denmark.
2Optics and Fluid Dynamics Department, OFD-129,
Risø National Laboratory
DK-4000 Roskilde, Denmark
Since the first fabrication of a holey fiber in 1996 , many investigations
on the remarkable properties of these fibers have been done. Holey fibers
are now used in many areas as nonlinear optics, quantum
electrodynamics, fiber optics, spectroscopy, biomedical optics,
metrology and many others . Photonic-crystal-fibers (PCF) are holey
fibers where the cladding holes are aranged in periodicity. Due to that
periodicity a photonic band-gap in the transmission spectra
perpendiculary to the waveguide direction is formed. The
photonic band-gap effect gives rise to an engineerable waveguide
contribution of the group-velocity-dispersion and very unsual chromatic
dispersion characteristics can be achieved using PCF.
Another important property of
PCF's is the strong confinment of the light around the fiber core, wich
gives rise to strong nonlinear effects. These two features lead to the
possibility of effective generation of supercontinuum light in PCF's.
We investigated the dispersion properties of PCF wich were then used to
model the propagation of ps and fs pulses by numerical integration of
generalized coupled nonlinear Shrödinger equations. As it was recently
shown experimentaly and numericalily by Coen et al. , our
simulations prove that PCF are a very promising tool for supercontinumm
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