I can't speak on the subject, but I just want to say I really enjoyed the Star-Trek-esque language (:

  Here, we introduce optical rotatum, a behavior of light in which
  an optical vortex beam experiences a quadratic chirp in its orbital
  angular momentum along the optical path. We show that such an adiabatic
  deformation of topology is associated with the accumulation of a Gouy
  phase factor, which, in turn, perturbs the propagation constant (spatial
  frequency) of the beam.

"Captain, if we can't reduce the adiabadic deformation of the Gouy phase factor, we'll never escape this optical vortex beam!"