Abstract
The optical vortex beam having helical phasefront carries well-defined orbital angular momentum (OAM) which can be specified by its topological charge (TC). This study demonstrates that interferogram having conjoined forks structure produced by self-referenced interference of laterally displaced vortex beams, allows simpler and unambiguous way of determining the sign and magnitude of TC. The proposed method uses a Mach–Zehnder interferometer set-up with controlled lateral displacement and tilt angles between the interfering beams, which results into an interferogram with better visual inspection. Theoretical description including intensity and phase profile has been presented.
Published Version
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