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We consider a microcavity made by a graded-index (GRIN) glass, doped by dyemolecules, placed within two planar mirrors and study Bose-Einsteincondensation (BEC) of photons. The presence of the mirrors leads to aneffective photon mass, and the index grading provides an effective trappingfrequency; the photon gas becomes formally equivalent to a two dimensional Bosegas trapped in an isotropic harmonic potential. The inclusion of nonlineareffects provides an effective interaction between photons. We discuss, inparticular, thermal lensing effects and nonlocal nonlinearity, andquantitatively compare our results with the reported experimental data.

Bose-Einstein condensation of photons with nonlocal nonlinearity in a dye-doped graded-index microcavity