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Author (up) Baudin, K.; Fusaro, A.; Garnier, J.; Berti, N.; Krupa, K.; Carusotto, I:, Rica, S.; Millot, G.; Picozzi, A. doi  openurl
  Title Energy and wave-action flows underlying Rayleigh-Jeans thermalization of optical waves propagating in a multimode fiber((a)) Type
  Year 2021 Publication EPL Abbreviated Journal EPL  
  Volume 134 Issue 1 Pages 14001  
  Abstract The wave turbulence theory predicts that a conservative system of nonlinear waves can exhibit a process of condensation, which originates in the singularity of the Rayleigh-Jeans equilibrium distribution of classical waves. Considering light propagation in a multimode fiber, we show that light condensation is driven by an energy flow toward the higher-order modes, and a bi-directional redistribution of the wave-action (or power) to the fundamental mode and to higher-order modes. The analysis of the near-field intensity distribution provides experimental evidence of this mechanism. The kinetic equation also shows that the wave-action and energy flows can be inverted through a thermalization toward a negative temperature equilibrium state, in which the high-order modes are more populated than low-order modes. In addition, a Bogoliubov stability analysis reveals that the condensate state is stable.  
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  Series Volume Series Issue Edition  
  ISSN 0295-5075 ISBN Medium  
  Area Expedition Conference  
  Notes WOS:000731468600008 Approved  
  Call Number UAI @ alexi.delcanto @ Serial 1510  
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