Avalanche instability of the orbital angular momentum higher order optical vortices
Theoretical and experimental studies of spectra of optical vortices and orbital angular momentum (OAM) carried by combined singular beams are presented. The combined beams are composed of superposition of Laguerre-Gauss or Bessel-Gauss modes with "resonant" amplitudes depending on a real p...
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Samara National Research University
2019-02-01
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doaj-17d8b1317b414e4f9cfc80aad594cb722020-11-24T22:10:51ZengSamara National Research UniversityКомпьютерная оптика0134-24522412-61792019-02-01431142410.18287/2412-6179-2019-43-1-14-24Avalanche instability of the orbital angular momentum higher order optical vorticesAlexander Volyar0Mikhail Bretsko1Yana Akimov2Yuriy Alexandrovich Egorov3Physics and Technology Institute (Academic Unit) of V.I. Vernadsky Crimean Federal University, Academician Vernadsky 4, 295007, Simferopol, Republic of Crimea, RussiaPhysics and Technology Institute (Academic Unit) of V.I. Vernadsky Crimean Federal University, Academician Vernadsky 4, 295007, Simferopol, Republic of Crimea, RussiaPhysics and Technology Institute (Academic Unit) of V.I. Vernadsky Crimean Federal University, Academician Vernadsky 4, 295007, Simferopol, Republic of Crimea, RussiaPhysics and Technology Institute (Academic Unit) of V.I. Vernadsky Crimean Federal University, Academician Vernadsky 4, 295007, Simferopol, Republic of Crimea, RussiaTheoretical and experimental studies of spectra of optical vortices and orbital angular momentum (OAM) carried by combined singular beams are presented. The combined beams are composed of superposition of Laguerre-Gauss or Bessel-Gauss modes with "resonant" amplitudes depending on a real parameter. If the parameter is an integer, then the OAM of the singular beam is equal to this number. If the real parameter is fractional, then the OAM can be either substantially larger or much smaller than the integer closest to the parameter value. For a non-integer value of the beam parameter, a large number of beams from superposition with integer topological charges contribute to its amplitude. For an integer beam parameter, the contribution to the amplitude is made by only one mode with a topological charge equal to the value of the beam parameter. In the experiment, singular beams with fractional OAMs were shaped using a binary amplitude diffraction grating consistent with the phase function of the singular beam. The measured correlation degree between the initial beam and the beam reconstructed from the vortex spectrum was no less than 90%.http://computeroptics.ru/KO/PDF/KO43-1/430102.pdfimage processingoptical vorticesorbital angular momentummoments of intensityдифракционная оптика |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Alexander Volyar Mikhail Bretsko Yana Akimov Yuriy Alexandrovich Egorov |
spellingShingle |
Alexander Volyar Mikhail Bretsko Yana Akimov Yuriy Alexandrovich Egorov Avalanche instability of the orbital angular momentum higher order optical vortices Компьютерная оптика image processing optical vortices orbital angular momentum moments of intensity дифракционная оптика |
author_facet |
Alexander Volyar Mikhail Bretsko Yana Akimov Yuriy Alexandrovich Egorov |
author_sort |
Alexander Volyar |
title |
Avalanche instability of the orbital angular momentum higher order optical vortices |
title_short |
Avalanche instability of the orbital angular momentum higher order optical vortices |
title_full |
Avalanche instability of the orbital angular momentum higher order optical vortices |
title_fullStr |
Avalanche instability of the orbital angular momentum higher order optical vortices |
title_full_unstemmed |
Avalanche instability of the orbital angular momentum higher order optical vortices |
title_sort |
avalanche instability of the orbital angular momentum higher order optical vortices |
publisher |
Samara National Research University |
series |
Компьютерная оптика |
issn |
0134-2452 2412-6179 |
publishDate |
2019-02-01 |
description |
Theoretical and experimental studies of spectra of optical vortices and orbital angular momentum (OAM) carried by combined singular beams are presented. The combined beams are composed of superposition of Laguerre-Gauss or Bessel-Gauss modes with "resonant" amplitudes depending on a real parameter. If the parameter is an integer, then the OAM of the singular beam is equal to this number. If the real parameter is fractional, then the OAM can be either substantially larger or much smaller than the integer closest to the parameter value. For a non-integer value of the beam parameter, a large number of beams from superposition with integer topological charges contribute to its amplitude. For an integer beam parameter, the contribution to the amplitude is made by only one mode with a topological charge equal to the value of the beam parameter. In the experiment, singular beams with fractional OAMs were shaped using a binary amplitude diffraction grating consistent with the phase function of the singular beam. The measured correlation degree between the initial beam and the beam reconstructed from the vortex spectrum was no less than 90%. |
topic |
image processing optical vortices orbital angular momentum moments of intensity дифракционная оптика |
url |
http://computeroptics.ru/KO/PDF/KO43-1/430102.pdf |
work_keys_str_mv |
AT alexandervolyar avalancheinstabilityoftheorbitalangularmomentumhigherorderopticalvortices AT mikhailbretsko avalancheinstabilityoftheorbitalangularmomentumhigherorderopticalvortices AT yanaakimov avalancheinstabilityoftheorbitalangularmomentumhigherorderopticalvortices AT yuriyalexandrovichegorov avalancheinstabilityoftheorbitalangularmomentumhigherorderopticalvortices |
_version_ |
1725806691384033280 |