Fig. 3: Results.

a Experimental results. b Simulation results. c Predictions using Eq. (3). d The evaluated radial distance on camera of the minima and maxima for d=100 μm, 160 μm, 220 μm. The integer and half-integer orders correspond to maxima and minima, respectively. e The quadratic coefficients a are obtained by fitting the data of d=100, 120, 140, 160, 180, 200, 220, 220 μm. The data (blue spots) are fitted by a linear function (red line). The ae-d relation (dashed line) of the equal-inclination interference is shown for comparison