Divergence of an orbital-angular-momentum-carrying beam upon propagation
There is recent interest in the use of light beams carrying orbital angular momentum (OAM) for creating multiple channels within free-space optical communication systems. One crucial issue is that, for a given beam size at the transmitter, the beam divergence angle increases with increasing OAM. The...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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IOP Publishing
2015-01-01
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| Series: | New Journal of Physics |
| Subjects: | |
| Online Access: | https://doi.org/10.1088/1367-2630/17/2/023011 |
| _version_ | 1797751219993706496 |
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| author | Miles J Padgett Filippo M Miatto Martin P J Lavery Anton Zeilinger Robert W Boyd |
| author_facet | Miles J Padgett Filippo M Miatto Martin P J Lavery Anton Zeilinger Robert W Boyd |
| author_sort | Miles J Padgett |
| collection | DOAJ |
| description | There is recent interest in the use of light beams carrying orbital angular momentum (OAM) for creating multiple channels within free-space optical communication systems. One crucial issue is that, for a given beam size at the transmitter, the beam divergence angle increases with increasing OAM. Therefore the larger the value of OAM, the larger the aperture required at the receiving optical system if the efficiency of detection is to be maintained. Confusion exists as to whether this divergence scales linearly with, or with the square root of, the beam’s OAM. We clarify how both these scaling laws are valid, depending upon whether it is the radius of the waist of the beam’s Gaussian term or the radius of rms intensity of the beam that is kept constant while varying the OAM. |
| first_indexed | 2024-03-12T16:44:19Z |
| format | Article |
| id | doaj.art-3f9dd643b8424dce86b0da4401dd9a36 |
| institution | Directory Open Access Journal |
| issn | 1367-2630 |
| language | English |
| last_indexed | 2024-03-12T16:44:19Z |
| publishDate | 2015-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | New Journal of Physics |
| spelling | doaj.art-3f9dd643b8424dce86b0da4401dd9a362023-08-08T14:17:42ZengIOP PublishingNew Journal of Physics1367-26302015-01-0117202301110.1088/1367-2630/17/2/023011Divergence of an orbital-angular-momentum-carrying beam upon propagationMiles J Padgett0Filippo M Miatto1Martin P J Lavery2Anton Zeilinger3Robert W Boyd4School of Physics and Astronomy, University of Glasgow , Glasgow G12 8QQ, UKDepartment of Physics, University of Ottawa , 150 Louis Pasteur, Ottawa, Ontario, K1N 6N5, CanadaSchool of Physics and Astronomy, University of Glasgow , Glasgow G12 8QQ, UKInstitute for Quantum Optics and Quantum Information (IQOQI) , Austrian Academy of Sciences, Boltzmanngasse 3, A-1090 Vienna, Austria; Vienna Center for Quantum Science and Technology, Faculty of Physics, University of Vienna , Boltzmanngasse 5, A-1090 Vienna, AustriaSchool of Physics and Astronomy, University of Glasgow , Glasgow G12 8QQ, UK; Department of Physics, University of Ottawa , 150 Louis Pasteur, Ottawa, Ontario, K1N 6N5, Canada; The Institute of Optics, University of Rochester , Rochester, NY 14627, USAThere is recent interest in the use of light beams carrying orbital angular momentum (OAM) for creating multiple channels within free-space optical communication systems. One crucial issue is that, for a given beam size at the transmitter, the beam divergence angle increases with increasing OAM. Therefore the larger the value of OAM, the larger the aperture required at the receiving optical system if the efficiency of detection is to be maintained. Confusion exists as to whether this divergence scales linearly with, or with the square root of, the beam’s OAM. We clarify how both these scaling laws are valid, depending upon whether it is the radius of the waist of the beam’s Gaussian term or the radius of rms intensity of the beam that is kept constant while varying the OAM.https://doi.org/10.1088/1367-2630/17/2/023011orbital angular momentumbeam divergencefree-space propagation |
| spellingShingle | Miles J Padgett Filippo M Miatto Martin P J Lavery Anton Zeilinger Robert W Boyd Divergence of an orbital-angular-momentum-carrying beam upon propagation New Journal of Physics orbital angular momentum beam divergence free-space propagation |
| title | Divergence of an orbital-angular-momentum-carrying beam upon propagation |
| title_full | Divergence of an orbital-angular-momentum-carrying beam upon propagation |
| title_fullStr | Divergence of an orbital-angular-momentum-carrying beam upon propagation |
| title_full_unstemmed | Divergence of an orbital-angular-momentum-carrying beam upon propagation |
| title_short | Divergence of an orbital-angular-momentum-carrying beam upon propagation |
| title_sort | divergence of an orbital angular momentum carrying beam upon propagation |
| topic | orbital angular momentum beam divergence free-space propagation |
| url | https://doi.org/10.1088/1367-2630/17/2/023011 |
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