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. 2021 Aug 16;29(17):27807-27815.
doi: 10.1364/OE.430406.

Bose-Einstein condensation of photons in a long fiber cavity

Rafi Weill, Alexander Bekker, Boris Levit, Baruch Fischer

Bose-Einstein condensation of photons in a long fiber cavity

Rafi Weill et al. Opt Express. .

Abstract

We demonstrate photon Bose-Einstein condensation (photon-BEC) at a broad temperature range that is valid also in the long 1D fiber cavity limit. It is done with an erbium-ytterbium co-doped fiber (EYDF) cavity by overcoming the challenging requirement of sublinear light dispersion for BEC in 1D using a chirped-gratings Fabry-Perot. We experimentally show with a square-root mode-dispersion, a quadratic temperature dependence of the critical power for condensation (compared to a linear dependence in finite regular fiber-cavities) between 90 K and 382 K, as the theory predicts.

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