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      Spatio-temporal evolution of ultrashort pulses in graded-index multimode fiber at normal dispersion

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      Author(s)
      Teğin, Uğur
      Ortaç, Bülend
      Date
      2017
      Source Title
      2017 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC)
      Publisher
      IEEE
      Language
      English
      Type
      Conference Paper
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      Abstract
      Summary form only given. A novel nonlinear phenomenon at normal dispersion regime inside of graded-index multimode fiber (GRIN MMF), geometric parametric instability (GPI), can be observed while propagating beam experiences spatio-temporal evolution. Longhi theoretically predicted this GPI and associated with periodic refocusing inside GRIN MMF [1]. Later his work is verified by Krupa et al. [2] and Lopez-Galmiche et al. [3] and discrete GPI sidebands are reported with more than 120 THz detuning from to pump frequency. These studies focused on quasi-continues pulse evolution in GRIN MMF and the spatio-temporal evolution of femtosecond pulses at normal dispersion regime remains unknown. Here, we present the first experimental observation of GPI sidebands with ultrashort pulses in GRIN MMF. To gain detailed understanding, we perform numerical simulations and theoretical calculations and obtained results are well-aligned with experimental observations.
      Keywords
      Laser beams
      Amplitude modulation
      Optical pulse generation
      Nanotechnology
      Dispersion
      Numerical simulation
      Laser excitation
      Permalink
      http://hdl.handle.net/11693/37657
      Published Version (Please cite this version)
      https://doi.org/10.1109/CLEOE-EQEC.2017.8086572
      Collections
      • Institute of Materials Science and Nanotechnology (UNAM) 2258
      • Nanotechnology Research Center (NANOTAM) 1179
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