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Efficient astigmatic mode-converter based on spherical mirrors

Efficient astigmatic mode-converter based on spherical mirrors
Efficient astigmatic mode-converter based on spherical mirrors
Laguerre-Gaussian (LGmn) modes have several unique properties that lend them to applications in materials processing [1] and particle manipulation [2], among others. One characteristic that lends these modes to such applications is their ability to carry orbital angular momentum (OAM), as opposed to the spin angular momentum of beams that are circularly polarised. There are several techniques for creating these; one popular one exploits the Gouy phase shift through the use of cylindrical lenses [3]. The Gouy phase shift causes a phase shift in a Gaussian beam as it passes through a focus and is dependent on the Rayleigh range of the beam. Using cylindrical lenses to create an astigmatic focal point you can create a relative phase shift between the sagittal and tangential planes of the beam. As a LG01 can be modelled as two orthogonal first order Hermite-Gaussian (HG01) modes, π out of phase with each other, you can exploit this to convert between the two modes. Furthermore, depending on whether the HG01 mode is at +45° or -45° to the astigmatic axis it will create an LG01 mode with either clockwise or anticlockwise orbital angular momentum.
Uren, R.T.
409f690c-eb0b-42cb-b1b7-3d334211235e
Clarkson, W.A.
3b060f63-a303-4fa5-ad50-95f166df1ba2
Uren, R.T.
409f690c-eb0b-42cb-b1b7-3d334211235e
Clarkson, W.A.
3b060f63-a303-4fa5-ad50-95f166df1ba2

Uren, R.T. and Clarkson, W.A. (2017) Efficient astigmatic mode-converter based on spherical mirrors. 2017 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC), , Munich, Germany. 25 - 29 Jun 2017. 1 pp . (doi:10.1109/CLEOE-EQEC.2017.8086261).

Record type: Conference or Workshop Item (Poster)

Abstract

Laguerre-Gaussian (LGmn) modes have several unique properties that lend them to applications in materials processing [1] and particle manipulation [2], among others. One characteristic that lends these modes to such applications is their ability to carry orbital angular momentum (OAM), as opposed to the spin angular momentum of beams that are circularly polarised. There are several techniques for creating these; one popular one exploits the Gouy phase shift through the use of cylindrical lenses [3]. The Gouy phase shift causes a phase shift in a Gaussian beam as it passes through a focus and is dependent on the Rayleigh range of the beam. Using cylindrical lenses to create an astigmatic focal point you can create a relative phase shift between the sagittal and tangential planes of the beam. As a LG01 can be modelled as two orthogonal first order Hermite-Gaussian (HG01) modes, π out of phase with each other, you can exploit this to convert between the two modes. Furthermore, depending on whether the HG01 mode is at +45° or -45° to the astigmatic axis it will create an LG01 mode with either clockwise or anticlockwise orbital angular momentum.

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More information

Published date: 30 October 2017
Venue - Dates: 2017 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC), , Munich, Germany, 2017-06-25 - 2017-06-29

Identifiers

Local EPrints ID: 442156
URI: http://eprints.soton.ac.uk/id/eprint/442156
PURE UUID: 12b31853-f0aa-4917-9f80-49fa824d16ba

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Date deposited: 07 Jul 2020 16:55
Last modified: 12 Dec 2021 10:12

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Contributors

Author: R.T. Uren
Author: W.A. Clarkson

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