Polariton occupation of the k=0 state vs time for (a) excitation powers of 0.42 W/cm2 (dashed), 4.2 W/cm2 (dotted), 168 W/cm2 (solid). The pump is turned on at t=0. The corresponding total polariton equilibrium densities are 7.0x1010 cm-2, 1.3x109 cm-2 and 1.3x1010 cm-2. (b) As (a) for a pump power of 0.42 W/cm2 and electron doping of 2.5 x109 cm-2 (dashed), 1010 (dotted), 4x1010 cm-2 (solid).
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