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Author  |
Baudin, K.; Fusaro, A.; Garnier, J.; Berti, N.; Krupa, K.; Carusotto, I:, Rica, S.; Millot, G.; Picozzi, A. |
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Title |
Energy and wave-action flows underlying Rayleigh-Jeans thermalization of optical waves propagating in a multimode fiber((a)) |
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2021 |
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EPL |
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EPL |
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134 |
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1 |
Pages |
14001 |
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Keywords |
BOSE-EINSTEIN CONDENSATION; TURBULENCE; TEMPERATURE; LIGHT |
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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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0295-5075 |
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Notes |
WOS:000731468600008 |
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UAI @ alexi.delcanto @ |
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1510 |
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