Dual self-image technique for beam collimation

We propose an accurate technique for obtaining highly collimated beams, which also allows testing the collimation degree of a beam. It is based on comparing the period of two different self-images produced by a single diffraction grating. In this way, variations in the period of the diffraction grat...

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Detalles Bibliográficos
Autores: Herrera Fernández, José María, Sánchez Brea, Luis Miguel, Torcal Milla, Francisco José, Morlanes Calvo, Tomás, Bernabeu Martínez, Eusebio
Tipo de recurso: artículo
Fecha de publicación:2016
País:España
Institución:Universidad Complutense de Madrid (UCM)
Repositorio:Docta Complutense
Idioma:inglés
OAI Identifier:oai:docta.ucm.es:20.500.14352/24622
Acceso en línea:https://hdl.handle.net/20.500.14352/24622
Access Level:acceso abierto
Palabra clave:535
Talbot effect
Self-imaging
Collimation
Diffraction
Óptica (Física)
2209.19 Óptica Física
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oai_identifier_str oai:docta.ucm.es:20.500.14352/24622
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repository_id_str
spelling Dual self-image technique for beam collimationHerrera Fernández, José MaríaSánchez Brea, Luis MiguelTorcal Milla, Francisco JoséMorlanes Calvo, TomásBernabeu Martínez, Eusebio535Talbot effectSelf-imagingCollimationDiffractionÓptica (Física)2209.19 Óptica FísicaWe propose an accurate technique for obtaining highly collimated beams, which also allows testing the collimation degree of a beam. It is based on comparing the period of two different self-images produced by a single diffraction grating. In this way, variations in the period of the diffraction grating do not affect to the measuring procedure. Self-images are acquired by two CMOS cameras and their periods are determined by fitting the variogram function of the self-images to a cosine function with polynomial envelopes. This way, loss of accuracy caused by imperfections of the measured self-images is avoided. As usual, collimation is obtained by displacing the collimation element with respect to the source along the optical axis. When the period of both self-images coincides, collimation is achieved. With this method neither a strict control of the period of the diffraction grating nor a transverse displacement, required in other techniques, are necessary. As an example, a LED considering paraxial approximation and point source illumination is collimated resulting a resolution in the divergence of the beam of σ φ = ± μrad.IOP PublishingUniversidad Complutense de Madrid20162016-06-1420162016-06-14journal articlehttp://purl.org/coar/resource_type/c_6501info:eu-repo/semantics/articleapplication/pdfhttps://hdl.handle.net/20.500.14352/24622reponame:Docta Complutenseinstname:Universidad Complutense de Madrid (UCM)Inglésengopen accesshttp://purl.org/coar/access_right/c_abf2info:eu-repo/semantics/openAccessoai:docta.ucm.es:20.500.14352/246222026-06-02T12:44:21Z
dc.title.none.fl_str_mv Dual self-image technique for beam collimation
title Dual self-image technique for beam collimation
spellingShingle Dual self-image technique for beam collimation
Herrera Fernández, José María
535
Talbot effect
Self-imaging
Collimation
Diffraction
Óptica (Física)
2209.19 Óptica Física
title_short Dual self-image technique for beam collimation
title_full Dual self-image technique for beam collimation
title_fullStr Dual self-image technique for beam collimation
title_full_unstemmed Dual self-image technique for beam collimation
title_sort Dual self-image technique for beam collimation
dc.creator.none.fl_str_mv Herrera Fernández, José María
Sánchez Brea, Luis Miguel
Torcal Milla, Francisco José
Morlanes Calvo, Tomás
Bernabeu Martínez, Eusebio
author Herrera Fernández, José María
author_facet Herrera Fernández, José María
Sánchez Brea, Luis Miguel
Torcal Milla, Francisco José
Morlanes Calvo, Tomás
Bernabeu Martínez, Eusebio
author_role author
author2 Sánchez Brea, Luis Miguel
Torcal Milla, Francisco José
Morlanes Calvo, Tomás
Bernabeu Martínez, Eusebio
author2_role author
author
author
author
dc.contributor.none.fl_str_mv Universidad Complutense de Madrid
dc.subject.none.fl_str_mv 535
Talbot effect
Self-imaging
Collimation
Diffraction
Óptica (Física)
2209.19 Óptica Física
topic 535
Talbot effect
Self-imaging
Collimation
Diffraction
Óptica (Física)
2209.19 Óptica Física
description We propose an accurate technique for obtaining highly collimated beams, which also allows testing the collimation degree of a beam. It is based on comparing the period of two different self-images produced by a single diffraction grating. In this way, variations in the period of the diffraction grating do not affect to the measuring procedure. Self-images are acquired by two CMOS cameras and their periods are determined by fitting the variogram function of the self-images to a cosine function with polynomial envelopes. This way, loss of accuracy caused by imperfections of the measured self-images is avoided. As usual, collimation is obtained by displacing the collimation element with respect to the source along the optical axis. When the period of both self-images coincides, collimation is achieved. With this method neither a strict control of the period of the diffraction grating nor a transverse displacement, required in other techniques, are necessary. As an example, a LED considering paraxial approximation and point source illumination is collimated resulting a resolution in the divergence of the beam of σ φ = ± μrad.
publishDate 2016
dc.date.none.fl_str_mv 2016
2016-06-14
2016
2016-06-14
dc.type.none.fl_str_mv journal article
http://purl.org/coar/resource_type/c_6501
dc.type.openaire.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv https://hdl.handle.net/20.500.14352/24622
url https://hdl.handle.net/20.500.14352/24622
dc.language.none.fl_str_mv Inglés
eng
language_invalid_str_mv Inglés
language eng
dc.rights.none.fl_str_mv open access
http://purl.org/coar/access_right/c_abf2
dc.rights.openaire.fl_str_mv info:eu-repo/semantics/openAccess
rights_invalid_str_mv open access
http://purl.org/coar/access_right/c_abf2
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv IOP Publishing
publisher.none.fl_str_mv IOP Publishing
dc.source.none.fl_str_mv reponame:Docta Complutense
instname:Universidad Complutense de Madrid (UCM)
instname_str Universidad Complutense de Madrid (UCM)
reponame_str Docta Complutense
collection Docta Complutense
repository.name.fl_str_mv
repository.mail.fl_str_mv
_version_ 1869404417228275712
score 15,300719

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