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

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  • Jacob Søndergaard Ramsay
  • Sune Vestergaard Lund Dupont, Danmark
  • Mikkel Johansen, Danmark
  • Lars Rishøj, DTU Ftonik, Dept. of Photonics Engineering, Tech. Uni. of Denmark, Danmark
  • Karsten Rottwitt, DTU Ftonik, Dept. of Photonics Engineering, Tech. Uni. of Denmark, Danmark
  • Peter Morten Moselund, NKT Photonics, Blokken 84, Birkerød, Danmark
  • Søren Rud Keiding
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 supercontinuum generation do not include scattering into HOMs, and including
this provides an extra degree of freedom for tailoring supercontinuum
sources.
OriginalsprogEngelsk
TidsskriftOptics Express
Vol/bind21
Nummer9
Sider (fra-til)10764-10771
Antal sider8
ISSN1094-4087
DOI
StatusUdgivet - 2013

    Forskningsområder

  • Laser, Fiber, Dispersion, Higher order modes

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