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Real and momentum space spectrally resolved images of microcavity polaritonemission in the regime of condensation are investigated under non resonantexcitation using a laser source with reduced intensity fluctuations on thetimescale of the exciton lifetime. We observe that the polariton emissionconsists of many macroscopically occupied modes. Lower energy modes arestrongly localized by the photonic potential disorder on a scale of fewmicrons. Higher energy modes have finite k-vectors and are delocalized over10-15 microns. All the modes exhibit long range spatial coherence comparable totheir size. We provide a theoretical model describing the behavior of thesystem with the results of the simulations in good agreement with theexperimental observations. We show that the multimode emission of the polaritoncondensate is a result of its nonequilibrium character, the interaction withthe local photonic potential and the reduced intensity fluctuations of theexcitation laser.

Coexisting Non-Equilibrium Condensates with Long-Range Spatial Coherence in Semiconductor Microcavities