We experimentally show that when higher-order optical vortices generated by a system of dielectric wedges are subjected to focusing they do not lose their structural stability.
© 2005 Optical Society of America
Diffraction and Gratings
Ya. Izdebskaya, V. Shvedov, and A. Volyar, "Focusing of wedge-generated higher-order optical vortices," Opt. Lett. 30, 2530-2532 (2005)