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We study exciton-polariton nonlinear optical fluids in a high momentum regimefor the first time. Defects in the fluid develop into dark solitons whosehealing length decreases with increasing density. We deduce interactionconstants for continuous wave polaritons an order of magnitude larger than withpicosecond pulses. Time dependent measurements show a 100ps time for thebuildup of the interaction strength suggesting a self-generated excitonicreservoir as the source of the extra nonlinearity. The experimental resultsagree well with a model of coupled photons, excitons and the reservoir.

Dark Solitons in Waveguide Polariton Fluids Shed Light on Interaction Constants