Figure 4
Experimental results of LG\(_{3,0}\) beam during astigmatic transformation and SHG process. Intensity profiles are taken at the planes [(i), (iv)] in Fig. 1. (a) Intensity profiles of the fundamental [(i), (ii)] and the SH signal [(iii), (iv)] for \(\alpha = 0\), \(10^\circ\), and \(15^\circ\). Phase profiles are also shown for signal on the plane (i) and (iv). (b) Experimental SHG electric field distribution for \(\alpha \in [0^\circ , 15^\circ ]\) in the far-field on the plane (iv). The singularities are marked with white dotted circle.
