Achromatic optical vortex lens.
A vortex lens is a useful optical device having applications ranging from astronomy to microscopy. Current vortex masks operate across a narrow bandwidth. Two design schemes are proposed for creating a vortex across a bandwidth exceeding 100 nm in the visible region of the spectrum.
Swartzlander
Grover A
GA
College of Optical Sciences, University of Arizona, Tucson, Arizona 85721, USA. grovers@optics.arizona.edu