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Angle-resolved photoluminescence spectroscopy was measured in a homebuilt microphotoluminescence setup in the Fourier imaging configuration. The continuous-wave pump laser of 442 nm was focused on the sample surface through a high–numerical aperture (NA, 0.9) 100× microscope objective, covering an angular range of ±64.1°. The emission from the microcavity was collected through the same objective and sent to a 550-mm focal length spectrometer (HORIBA iHR550) with a grating of 600 lines/mm and a liquid nitrogen–cooled charge-coupled device of 256 × 1024 pixels. To reach polariton condensation, the perovskite microcavity was pumped by off-resonant excitation centered at 400 nm with a pulse duration of 100 fs and repetition rates of 1 kHz (double frequency from 800-nm laser from a Spitfire Ace Ti:sapphire regenerative amplifier by a beta barium borate crystal). The excitation laser was focused down to a ~20-μm-diameter spot on the sample. The fluorescence image from the perovskite microcavity was obtained through an Olympus microscope, where the microcavity was illuminated with a halogen lamp after passing through a band-pass filter.

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