Ultrashort vortex from a Gaussian pulse – An achromatic-interferometric approach

Abstract The more than a century old Sagnac interferometer is put to first of its kind use to generate an achromatic single-charge vortex equivalent to a Laguerre-Gaussian beam possessing orbital angular momentum (OAM). The interference of counter-propagating polychromatic Gaussian beams of beam wai...

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Autores principales:	Dinesh N. Naik, Nabil A. Saad, D. Narayana Rao, Nirmal K. Viswanathan
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/0715be82110d4571adf3516dbe4df593
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spelling	oai:doaj.org-article:0715be82110d4571adf3516dbe4df5932021-12-02T11:52:41ZUltrashort vortex from a Gaussian pulse – An achromatic-interferometric approach10.1038/s41598-017-02613-32045-2322https://doaj.org/article/0715be82110d4571adf3516dbe4df5932017-05-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-02613-3https://doaj.org/toc/2045-2322Abstract The more than a century old Sagnac interferometer is put to first of its kind use to generate an achromatic single-charge vortex equivalent to a Laguerre-Gaussian beam possessing orbital angular momentum (OAM). The interference of counter-propagating polychromatic Gaussian beams of beam waist ωλ with correlated linear phase (ϕ 0 ≥ 0.025 λ) and lateral shear (y 0 ≥ 0.05 ωλ) in orthogonal directions is shown to create a vortex phase distribution around the null interference. Using a wavelength-tunable continuous-wave laser the entire range of visible wavelengths is shown to satisfy the condition for vortex generation to achieve a highly stable white-light vortex with excellent propagation integrity. The application capablitiy of the proposed scheme is demonstrated by generating ultrashort optical vortex pulses, its nonlinear frequency conversion and transforming them to vector pulses. We believe that our scheme for generating robust achromatic vortex (implemented with only mirrors and a beam-splitter) pulses in the femtosecond regime, with no conceivable spectral-temporal range and peak-power limitations, can have significant advantages for a variety of applications.Dinesh N. NaikNabil A. SaadD. Narayana RaoNirmal K. ViswanathanNature 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 Dinesh N. Naik Nabil A. Saad D. Narayana Rao Nirmal K. Viswanathan Ultrashort vortex from a Gaussian pulse – An achromatic-interferometric approach
description	Abstract The more than a century old Sagnac interferometer is put to first of its kind use to generate an achromatic single-charge vortex equivalent to a Laguerre-Gaussian beam possessing orbital angular momentum (OAM). The interference of counter-propagating polychromatic Gaussian beams of beam waist ωλ with correlated linear phase (ϕ 0 ≥ 0.025 λ) and lateral shear (y 0 ≥ 0.05 ωλ) in orthogonal directions is shown to create a vortex phase distribution around the null interference. Using a wavelength-tunable continuous-wave laser the entire range of visible wavelengths is shown to satisfy the condition for vortex generation to achieve a highly stable white-light vortex with excellent propagation integrity. The application capablitiy of the proposed scheme is demonstrated by generating ultrashort optical vortex pulses, its nonlinear frequency conversion and transforming them to vector pulses. We believe that our scheme for generating robust achromatic vortex (implemented with only mirrors and a beam-splitter) pulses in the femtosecond regime, with no conceivable spectral-temporal range and peak-power limitations, can have significant advantages for a variety of applications.
format	article
author	Dinesh N. Naik Nabil A. Saad D. Narayana Rao Nirmal K. Viswanathan
author_facet	Dinesh N. Naik Nabil A. Saad D. Narayana Rao Nirmal K. Viswanathan
author_sort	Dinesh N. Naik
title	Ultrashort vortex from a Gaussian pulse – An achromatic-interferometric approach
title_short	Ultrashort vortex from a Gaussian pulse – An achromatic-interferometric approach
title_full	Ultrashort vortex from a Gaussian pulse – An achromatic-interferometric approach
title_fullStr	Ultrashort vortex from a Gaussian pulse – An achromatic-interferometric approach
title_full_unstemmed	Ultrashort vortex from a Gaussian pulse – An achromatic-interferometric approach
title_sort	ultrashort vortex from a gaussian pulse – an achromatic-interferometric approach
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/0715be82110d4571adf3516dbe4df593
work_keys_str_mv	AT dineshnnaik ultrashortvortexfromagaussianpulseanachromaticinterferometricapproach AT nabilasaad ultrashortvortexfromagaussianpulseanachromaticinterferometricapproach AT dnarayanarao ultrashortvortexfromagaussianpulseanachromaticinterferometricapproach AT nirmalkviswanathan ultrashortvortexfromagaussianpulseanachromaticinterferometricapproach
_version_	1718394965209382912

Ultrashort vortex from a Gaussian pulse – An achromatic-interferometric approach

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