Fig. 4

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Phase profiles in the focal plane for the signal beam (top row) and reference beam (bottom row). The profiles are shown for an input beam experiencing turbulence-induced distortion as tilt along xi (J = 2) in (a) and (e), defocus (J = 4) in (b) and (f), primary coma along xi (J = 8) in (c) and (g), and secondary coma along xi (J = 16) in (d) and (h). The phase is displayed as colours mapped from low (blue) to red (high), given pinhole apertures with diameters of d = 15 and 75 μm (seen in the bottom row as small and large black circles, respectively), and a fringe spacing of Λ = 87 μm.
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