Spatial beam cleanup by pure Kerr processes in multimode fibers

Jesper Lægsgaard*

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review


Recent experiments with pulse propagation in multimode graded-index fibers have shown a nonlinear improvement in beam quality, even in situations where dissipative processes such as Raman scattering play no significant role. In this Letter, numerical simulations of beam cleanup by third-order Kerr nonlinearities in a multimode fiber are used to demonstrate that in the absence of dissipative processes beam cleanup is crucially dependent on spectral/temporal disorder and does not occur in a continuous-wave model. This finding is in accordance with fundamental considerations on entropy. (C) 2018 Optical Society of America
Original languageEnglish
JournalOptics Letters
Issue number11
Pages (from-to)2700-2703
Publication statusPublished - 2018


  • Optoelectronic devices
  • Beam cleanup
  • Continuous Wave
  • Dissipative process
  • Graded-index fibers
  • Kerr nonlinearity
  • Pulse propagation
  • Spatial beams
  • Third order
  • Multimode fibers
  • Light, Optics and Optical Devices

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