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Applicant:
Indian Institute of Technology (IIT) Patna 
Author:
P. Kumar and N. K. Nishchal 
Corresponding Authors:
Naveen K. Nishchal 
DOI #:
https://doi.org/10.1016/j.optcom.2019.125000 
Title:
Self-referenced interference of laterally displaced vortex beams for topological charge determination 
Journal:
Optics Communications  
Year:
2020 
Volume:
459 
Page:
125000 
Keywords:
Vortex beams, Orbital angular momentum of light, Mach–Zehnder interferometer 
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. 
Entered by:
Venkata Dantham on 2020-08-03 
 
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