The fork grating used to create the vortices. The "Y" region produces the singularity.
The Y is magnified by the Ronchi grating as an effect of Moiré aliasing.
Projections of optical vortices.
The first photo is the combination of the Ronchi and fork gratings 90° out of phase.
The other is the result when only the Ronchi grating is used.
The vortices projected onto a .25" grid. The close-ups are of vortices of topological charge 1, 2 and 3, respectively.
For other research (fiber optics) pictures, see my
WISE web page.
Presentation to my WISE group, May 2004
thumbnail images made with jpg2html
My poster at the Research Celebration, 21 April 2004