Indian Journal of Pure and Applied Physics

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Generation of Higher Order Laguerre-Gaussian Beams through Combination of Lower Order Phase Elements


Affiliations
1 CSIR-National Physical Laboratory, Dr K. S. Krishnan Marg, New Delhi 110 012, India
2 Department of Physics, Shaheed Rajguru College of Applied Sciences for Women, University of Delhi, Vasundhara Enclave, New Delhi 110 096, India
3 Department of Physics, Hansraj College, University of Delhi, MalkaGanj, North Campus, New Delhi 110 007, India
4 Department of Physics, Sri Aurobindo College, University of Delhi, Malviya Nagar, New Delhi 110 017, India

Laguerre-Gaussian (LG) beam is a vortex beam, which is characterised by its helical phase, and has a number of potential applications apart from being a precursor for generation of other vortex beams. Generation of LG beams, carrying higher-order orbital angular momentum (OAM), have been demonstrated by the utilization of multiple vortex phase plates (VPPs) with capability of imparting lower topological charges (TCs). The TCs of the generated LG beams were experimentally ascertained by the analysis of fork patterns generated by interfering the generated LG beams with their corresponding reference Gaussian beams. The experimentally obtained amplitude profiles and fork patterns, exhibited a fair agreement with the results of theoretical formulations.

Keywords

L G beams; Orbital angular momentum; Topological charges; Graphene
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  • Generation of Higher Order Laguerre-Gaussian Beams through Combination of Lower Order Phase Elements

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Authors

Swati Gangwar
CSIR-National Physical Laboratory, Dr K. S. Krishnan Marg, New Delhi 110 012, India
Chanchal Rawat
Department of Physics, Shaheed Rajguru College of Applied Sciences for Women, University of Delhi, Vasundhara Enclave, New Delhi 110 096, India
Yogesh Kumar
Department of Physics, Hansraj College, University of Delhi, MalkaGanj, North Campus, New Delhi 110 007, India
Poonam Jain
Department of Physics, Sri Aurobindo College, University of Delhi, Malviya Nagar, New Delhi 110 017, India
V. K. Jaiswal
CSIR-National Physical Laboratory, Dr K. S. Krishnan Marg, New Delhi 110 012, India
Shibu Saha
CSIR-National Physical Laboratory, Dr K. S. Krishnan Marg, New Delhi 110 012, India
Parag Sharma
CSIR-National Physical Laboratory, Dr K. S. Krishnan Marg, New Delhi 110 012, India

Abstract


Laguerre-Gaussian (LG) beam is a vortex beam, which is characterised by its helical phase, and has a number of potential applications apart from being a precursor for generation of other vortex beams. Generation of LG beams, carrying higher-order orbital angular momentum (OAM), have been demonstrated by the utilization of multiple vortex phase plates (VPPs) with capability of imparting lower topological charges (TCs). The TCs of the generated LG beams were experimentally ascertained by the analysis of fork patterns generated by interfering the generated LG beams with their corresponding reference Gaussian beams. The experimentally obtained amplitude profiles and fork patterns, exhibited a fair agreement with the results of theoretical formulations.

Keywords


L G beams; Orbital angular momentum; Topological charges; Graphene