UFR de Physique

Propositions de stages en laboratoire -- M2

Les offres sont actualisées en mai. Par exemple, les offres de stages pour l'année universitaire 2015-2016 seront mises en place en mai 2015, les offres de stages pour l'année universitaire 2016-2017 seront mises en place pour en mai 2016, etc.

Nonlinear optics in highly multimode optical fibers

  • Option Lumière-Matière, Générique du parcours Lumière-Matière
  • Laboratoire: Laboratoire de Physique des Lasers, Atomes et Molécules (PhLAM)
  • Responsable du stage: KUDLINSKI Alexandre (alexandre.kudlinski@univ-lille1.fr, 03.62.53.15.42)
  • Co-responsable(s): Matteo CONFORTI, Arnaud MUSSOT
  • Mots clés: Photonics, optical fibers, nonlinear optics
  • Fiche complète en PDF : Fiche complète en PDF

The topic of the research training deals with the study of nonlinear effects in graded-index highly multimode fibers. Very recent studies 1,2 have shown the possibility to observe significant nonlinear effects in this type of fibers using high power nanosecond and femtosecond pulses. Their origin is linked to the linear properties of graded-index fibers, which feature a periodic self-imaging of the modal distribution along the fiber. This induces a periodic evolution of the intensity in the center of the fiber core, which allows quasi phase-matching processes to take place, and thus the generation of new frequencies. We would like to study these effects in graded-index fibers with a periodically varying core diameter along the fiber, with a period which is close to the modal self-imaging period. The fabrication of these fibers will be done at the FiberTech technological facility located at the IRCICA institute, where the technology allowing to fabricate these fibers is currently under progress. This double periodicity should lead to the observation of new nonlinear wave mixings and thus of new spectral components. The student will participate to the technological developement and/or to nonlinear optics experiments, or to theoretical and numerical simulation studies, depending on hie/her wishes.

1. L. G. Wright, Z. Liu, D. A. Nolan, M.-J. Li, D. N. Christodoulides, and F. W. Wise, "Self-organized instability in graded-index multimode fibres," Nat. Photonics 10, 771–776 (2016). 2. K. Krupa, A. Tonello, A. Barthélémy, V. Couderc, B. M. Shalaby, A. Bendahmane, G. Millot, and S. Wabnitz, "Observation of Geometric Parametric Instability Induced by the Periodic Spatial Self-Imaging of Multimode Waves," Phys. Rev. Lett. 116, 183901 (2016).