Selective phase shift induced bored helical beam rotation

Abstract

In this work, the transverse intensity pattern formation and evolution upon propagation of beams possessing the bored helical phase is analyzed in relation to the Gouy phase shift. The bored helical phase is a modification of the helical phase by boring a cavity centered along the phase singularity. We investigate two modes of phase shifting and its effects on the beam profile through models. Controllable rotation is achieved by introducing a phase shift exclusive to the helical region of the bored helical phase. Effects of such phase shifting are verified through experiment via reconstruction of computergenerated holograms.