Broadband nulling of a vortex phase mask.
A pulse transmitted through a helical vortex phase mask undergoes a temporal Hilbert transform. The fluence transmitted into the unfavorable plane wave mode is found to increase as the square of the bandwidth and, to first order, is independent of the topological charge.
Swartzlander
Grover A
GA
College of Optical Sciences, University of Arizona, Tucson, Arizona 85721, USA. grovers@optics.arizona.edu