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(Color online) (a)-(c) Fourier space PL images of the microcavity as a function of excitation power. The threshold excitation power density is Pthr = 0.6 J cm−2 per pulse. The dashed lines represent the uncoupled exciton (X) and cavity photon (C) modes, and the result of the two-level coupled oscillator model is shown as a plain line for δ = −18 meV and Ω =130 meV; (d) occupancy of the LPB as a function of emission energy, calculated at each angle as the intensity of the LPB signal, divided by the photon fraction, and corrected for the collection geometry factor cos(θ).
(Color online) Power dependent series of (a) Fourier PL and (b) macroPL spectra measured at θ = 0° ± 2°. The polariton lasing threshold corresponds to the red spectrum. The excitation power density relatively to the threshold power is indicated for each spectrum.
(Color online) (a) Linewidth of the LPB transition at k = 0 observed in Fourier PL spectra (Fig. 2(a)); above threshold (indicated by the vertical dashed line), only the fundamental mode at 3.287 eV is fitted by a Gaussian lineshape. (b) and (c) Amplitude and energy of the LPB transition observed in macroPL spectra (Fig. 2(b)); the spectra are fitted by 3 Gaussians, corresponding to inhomogeneously broadened transitions, and for the 2nd asymmetric lasing polariton peak, only the low energy half of the peak is considered for the fit. The black dashed line in (b) represents the derived power law dependence of the LPB emission below threshold.
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