Identifying the tilt angle and correcting the orbital angular momentum spectrum dispersion of misaligned light beam

Abstract The axis tilt of light beam in optical system would introduce the dispersion of orbital angular momentum (OAM) spectrum. To deal with it, a two-step method is proposed and demonstrated. First, the tilt angle of optical axis is identified with a deduced relation between the tilt angle and th...

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Autores principales:	Peng Zhao, Shikang Li, Yu Wang, Xue Feng, Cui Kaiyu, Liu Fang, Wei Zhang, Yidong Huang
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/189756a2008b40f4bcd957eb54380248
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spelling	oai:doaj.org-article:189756a2008b40f4bcd957eb543802482021-12-02T16:06:38ZIdentifying the tilt angle and correcting the orbital angular momentum spectrum dispersion of misaligned light beam10.1038/s41598-017-07734-32045-2322https://doaj.org/article/189756a2008b40f4bcd957eb543802482017-08-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-07734-3https://doaj.org/toc/2045-2322Abstract The axis tilt of light beam in optical system would introduce the dispersion of orbital angular momentum (OAM) spectrum. To deal with it, a two-step method is proposed and demonstrated. First, the tilt angle of optical axis is identified with a deduced relation between the tilt angle and the variation of OAM topological charges with different reference axes, which is obtained with the help of a charge coupled device (CCD) camera. In our experiments, the precision of measured tilt angle is about 10−4 rad with topological charges of −3~3. With the measured angle value, the additional phase delay due to axis tilt can be calculated so that the dispersion of OAM spectrum can be corrected with a simple formula while the optical axis is not aligned. The experimental results indicate that the original OAM spectrum has been successfully extracted for not only the pure state but also the superposed OAM states.Peng ZhaoShikang LiYu WangXue FengCui KaiyuLiu FangWei ZhangYidong HuangNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-10 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Peng Zhao Shikang Li Yu Wang Xue Feng Cui Kaiyu Liu Fang Wei Zhang Yidong Huang Identifying the tilt angle and correcting the orbital angular momentum spectrum dispersion of misaligned light beam
description	Abstract The axis tilt of light beam in optical system would introduce the dispersion of orbital angular momentum (OAM) spectrum. To deal with it, a two-step method is proposed and demonstrated. First, the tilt angle of optical axis is identified with a deduced relation between the tilt angle and the variation of OAM topological charges with different reference axes, which is obtained with the help of a charge coupled device (CCD) camera. In our experiments, the precision of measured tilt angle is about 10−4 rad with topological charges of −3~3. With the measured angle value, the additional phase delay due to axis tilt can be calculated so that the dispersion of OAM spectrum can be corrected with a simple formula while the optical axis is not aligned. The experimental results indicate that the original OAM spectrum has been successfully extracted for not only the pure state but also the superposed OAM states.
format	article
author	Peng Zhao Shikang Li Yu Wang Xue Feng Cui Kaiyu Liu Fang Wei Zhang Yidong Huang
author_facet	Peng Zhao Shikang Li Yu Wang Xue Feng Cui Kaiyu Liu Fang Wei Zhang Yidong Huang
author_sort	Peng Zhao
title	Identifying the tilt angle and correcting the orbital angular momentum spectrum dispersion of misaligned light beam
title_short	Identifying the tilt angle and correcting the orbital angular momentum spectrum dispersion of misaligned light beam
title_full	Identifying the tilt angle and correcting the orbital angular momentum spectrum dispersion of misaligned light beam
title_fullStr	Identifying the tilt angle and correcting the orbital angular momentum spectrum dispersion of misaligned light beam
title_full_unstemmed	Identifying the tilt angle and correcting the orbital angular momentum spectrum dispersion of misaligned light beam
title_sort	identifying the tilt angle and correcting the orbital angular momentum spectrum dispersion of misaligned light beam
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/189756a2008b40f4bcd957eb54380248
work_keys_str_mv	AT pengzhao identifyingthetiltangleandcorrectingtheorbitalangularmomentumspectrumdispersionofmisalignedlightbeam AT shikangli identifyingthetiltangleandcorrectingtheorbitalangularmomentumspectrumdispersionofmisalignedlightbeam AT yuwang identifyingthetiltangleandcorrectingtheorbitalangularmomentumspectrumdispersionofmisalignedlightbeam AT xuefeng identifyingthetiltangleandcorrectingtheorbitalangularmomentumspectrumdispersionofmisalignedlightbeam AT cuikaiyu identifyingthetiltangleandcorrectingtheorbitalangularmomentumspectrumdispersionofmisalignedlightbeam AT liufang identifyingthetiltangleandcorrectingtheorbitalangularmomentumspectrumdispersionofmisalignedlightbeam AT weizhang identifyingthetiltangleandcorrectingtheorbitalangularmomentumspectrumdispersionofmisalignedlightbeam AT yidonghuang identifyingthetiltangleandcorrectingtheorbitalangularmomentumspectrumdispersionofmisalignedlightbeam
_version_	1718384886653386752

Identifying the tilt angle and correcting the orbital angular momentum spectrum dispersion of misaligned light beam

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