Figure 2

(upper) 2D intensity distribution of numerically calculated and experimentally observed symmetric and asymmetric OVs (\(\ell =20\)). (lower) The interferograms obtained by superposing a Gaussian reference beam and an OV beam. The asymmetry parameter for the calculations is \([\text {Im}(x_\text {s}), \text {Im}(y_\text {s})]=[-w_0/5, 0]\).