Thick fringe pattern of high-order vortex; actual vortex (why does it look like a spiral?); thin fringe pattern

Vortex made from cracked plastic; collinear interferogram

9 frames of rotating collinear interferogram; multi-armed collinear interferogram; actual vortex beam

Interferogram of fractional vortex from cracked plastic; fractional vortex

Interferogram of integral-looking vortex from cracked plastic; actual vortex

Color picture of vortex in tweezers using cracked plastic on inch-graph paper; black-and-white picture

made with jpg2html