Generation of infrared supercontinuum radiation: spatial mode dispersion and higher-order mode propagation in ZBLAN step-index fibers | Zendy

Jacob Ramsay | Zendy; Sune Dupont | Zendy; Mikkel Willum Johansen | Zendy; Lars Rishøj | Zendy; Karsten Rottwitt | Zendy; Peter M. Moselund | Zendy; S. R. Keiding | Zendy

Open Access

Generation of infrared supercontinuum radiation: spatial mode dispersion and higher-order mode propagation in ZBLAN step-index fibers

Author(s) -

Jacob Ramsay,

Sune Dupont,

Mikkel Willum Johansen,

Lars Rishøj,

Karsten Rottwitt,

Peter M. Moselund,

S. R. Keiding

Publication year - 2013

Publication title -

optics express

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.394

H-Index - 271

ISSN - 1094-4087

DOI - 10.1364/oe.21.010764

Subject(s) - supercontinuum , zblan , optics , femtosecond , materials science , infrared , photon upconversion , scattering , wavelength , radiation , optoelectronics , physics , laser , photonic crystal fiber , fiber laser

Using femtosecond upconversion we investigate the time and wavelength structure of infrared supercontinuum generation. It is shown that radiation is scattered into higher order spatial modes (HOMs) when generating a supercontinuum using fibers that are not single-moded, such as a step-index ZBLAN fiber. As a consequence of intermodal scattering and the difference in group velocity for the modes, the supercontinuum splits up spatially and temporally. Experimental results indicate that a significant part of the radiation propagates in HOMs. Conventional simulations of super-continuum generation do not include scattering into HOMs, and including this provides an extra degree of freedom for tailoring supercontinuum sources.

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