An optical-vortex filament is characterized by a dark core of vanishing size and fluidlike propagation dynamics in the near-field region. This type of phase singularity does not naturally occur as an eigenmode of a cylindrically symmetric system, but it can be easily formed by computer-generated holography. The size of the core is an important attribute affecting vortex–vortex interactions within a laser beam. Here we demonstrate a means to minimize the core size, and we experimentally show that a beam-to-core size ratio exceeding 175 may be readily achieved.
© 1998 Optical Society of America
(090.1760) Holography : Computer holography
Z. S. Sacks, D. Rozas, and G. A. Swartzlander, Jr., "Holographic formation of optical-vortex filaments," J. Opt. Soc. Am. B 15, 2226-2234 (1998)