Figure 4: Self-reconstruction of a non-Gaussian mode generated with atomic vapor.
From: Atomic vapor as a source of tunable, non-Gaussian self-reconstructing optical modes
(a) Images of unobstructed (top) and obstructed (bottom) modes at various positions along the propagation coordinate. The size of each image is 1.5 mm × 1.5 mm, and the images correspond to the region over which the obstructed area correlation is calculated. (b) Calculated two-dimensional correlation between the (unobstructed) reference at z = 0 m and the obstructed modes at various positions for the full image (blue) and the obstruction area only (red). In the latter case, a parabolic fit reveals an optimal correlation at z ~ 7.5 m. The shaded regions indicate uncertainties based on one standard deviation. (c) Full width half maxima of central peaks normalized to their widths at z = 0 m, for a BG-like mode with a focal position zfocus = 5.5 m and a Gaussian mode with zfocus = 1.1 m. In both cases, approximately 20% of the light is blocked. The inset shows cross-sections of the reference and obstructed BG-like modes at the optimal reconstruction distance of z = 7.5 m.
