Fig. 2
From: First-order spatial coherence measurements in a thermalized two-dimensional photonic quantum gas
Temporal and spatial correlations of thermal photon gas. a The top panel shows the variation of the camera signal detected by the camera pixel closest to r = 0 in the image plane as a function of the time delay due to different interferometer path lengths for a thermal photon gas (N ≪ N c). The inset gives a zoomed view into the central fringes. The bottom plot shows the corresponding variation of the fringe visibility along with a fit to |g (1)(τ)| (solid). b Map of the observed fringe visibility (raw data) vs. transverse position in the camera plane. c Offset corrected fringe visibility vs. radial distance from the center (red), along with a Gaussian fit (black). After correcting for the measured resolution of the imaging system, the curve directly maps the extent of the thermal de Broglie wave packets. (T = 307 K, N/N c ≃ 10−4)
