High-order-harmonic spectra from atoms in intense laser fields: Exact versus approximate methods

Autores
Pugliese, Silvina Norma; Simonsen, A. S.; Førre, M.; Hansen, J. P.
Año de publicación
2015
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
We compare harmonic spectra from hydrogen based on the numerical solution of the time-dependent Schrödinger equation and three approximate models: (i) the strong field approximation (SFA), (ii) the Coulomb-Volkov modified strong field approximation (CVA), and (iii) the strong field approximation with the stationary phase approximation applied to the momentum integrals (SPSFA). At laser intensities in the range of (1-3)×1014W/cm2 we find good agreement when comparing the SFA and CVA with exact results. In general the CVA displays an overall better agreement with ab initio results, which reflects the role of the Coulomb field in the ionization as well as in the recombination process. Furthermore, it is found that the widely used SPSFA breaks down for low-order harmonic generation; i.e., the approximation turns out to be accurate only in the outer part of the harmonic plateau region as well as in the cutoff region. We trace this deficiency to the singularity of the SPSFA associated with short trajectories, i.e., short return times. When removing these, we obtain a version of the SPSFA which works rather well for the entire harmonic spectrum.
Fil: Pugliese, Silvina Norma. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Comisión Nacional de Energía Atómica. Centro Atómico Bariloche; Argentina
Fil: Simonsen, A. S.. University Of Bergen; Noruega
Fil: Førre, M.. University Of Bergen; Noruega
Fil: Hansen, J. P.. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. University Of Bergen; Noruega. Comisión Nacional de Energía Atómica. Centro Atómico Bariloche; Argentina
Materia
High-order-harmonic generation
Strong field approximation
Coulomb-Volkov approximation
Stationary phase approximation
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/54941
Acceder
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network_name_str CONICET Digital (CONICET)
spelling High-order-harmonic spectra from atoms in intense laser fields: Exact versus approximate methodsPugliese, Silvina NormaSimonsen, A. S.Førre, M.Hansen, J. P.High-order-harmonic generationStrong field approximationCoulomb-Volkov approximationStationary phase approximationhttps://purl.org/becyt/ford/1.3https://purl.org/becyt/ford/1We compare harmonic spectra from hydrogen based on the numerical solution of the time-dependent Schrödinger equation and three approximate models: (i) the strong field approximation (SFA), (ii) the Coulomb-Volkov modified strong field approximation (CVA), and (iii) the strong field approximation with the stationary phase approximation applied to the momentum integrals (SPSFA). At laser intensities in the range of (1-3)×1014W/cm2 we find good agreement when comparing the SFA and CVA with exact results. In general the CVA displays an overall better agreement with ab initio results, which reflects the role of the Coulomb field in the ionization as well as in the recombination process. Furthermore, it is found that the widely used SPSFA breaks down for low-order harmonic generation; i.e., the approximation turns out to be accurate only in the outer part of the harmonic plateau region as well as in the cutoff region. We trace this deficiency to the singularity of the SPSFA associated with short trajectories, i.e., short return times. When removing these, we obtain a version of the SPSFA which works rather well for the entire harmonic spectrum.Fil: Pugliese, Silvina Norma. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Comisión Nacional de Energía Atómica. Centro Atómico Bariloche; ArgentinaFil: Simonsen, A. S.. University Of Bergen; NoruegaFil: Førre, M.. University Of Bergen; NoruegaFil: Hansen, J. P.. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. University Of Bergen; Noruega. Comisión Nacional de Energía Atómica. Centro Atómico Bariloche; ArgentinaAmerican Physical Society2015-08info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/54941Pugliese, Silvina Norma; Simonsen, A. S.; Førre, M.; Hansen, J. P.; High-order-harmonic spectra from atoms in intense laser fields: Exact versus approximate methods; American Physical Society; Physical Review A: Atomic, Molecular and Optical Physics; 92; 2; 8-2015; 023424-1-023424-81050-2947CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/doi/10.1103/PhysRevA.92.023424info:eu-repo/semantics/altIdentifier/url/https://journals.aps.org/pra/abstract/10.1103/PhysRevA.92.023424info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-10T13:07:42Zoai:ri.conicet.gov.ar:11336/54941instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982025-09-10 13:07:42.712CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv High-order-harmonic spectra from atoms in intense laser fields: Exact versus approximate methods
title High-order-harmonic spectra from atoms in intense laser fields: Exact versus approximate methods
spellingShingle High-order-harmonic spectra from atoms in intense laser fields: Exact versus approximate methods
Pugliese, Silvina Norma
High-order-harmonic generation
Strong field approximation
Coulomb-Volkov approximation
Stationary phase approximation
title_short High-order-harmonic spectra from atoms in intense laser fields: Exact versus approximate methods
title_full High-order-harmonic spectra from atoms in intense laser fields: Exact versus approximate methods
title_fullStr High-order-harmonic spectra from atoms in intense laser fields: Exact versus approximate methods
title_full_unstemmed High-order-harmonic spectra from atoms in intense laser fields: Exact versus approximate methods
title_sort High-order-harmonic spectra from atoms in intense laser fields: Exact versus approximate methods
dc.creator.none.fl_str_mv Pugliese, Silvina Norma
Simonsen, A. S.
Førre, M.
Hansen, J. P.
author Pugliese, Silvina Norma
author_facet Pugliese, Silvina Norma
Simonsen, A. S.
Førre, M.
Hansen, J. P.
author_role author
author2 Simonsen, A. S.
Førre, M.
Hansen, J. P.
author2_role author
author
author
dc.subject.none.fl_str_mv High-order-harmonic generation
Strong field approximation
Coulomb-Volkov approximation
Stationary phase approximation
topic High-order-harmonic generation
Strong field approximation
Coulomb-Volkov approximation
Stationary phase approximation
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.3
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv We compare harmonic spectra from hydrogen based on the numerical solution of the time-dependent Schrödinger equation and three approximate models: (i) the strong field approximation (SFA), (ii) the Coulomb-Volkov modified strong field approximation (CVA), and (iii) the strong field approximation with the stationary phase approximation applied to the momentum integrals (SPSFA). At laser intensities in the range of (1-3)×1014W/cm2 we find good agreement when comparing the SFA and CVA with exact results. In general the CVA displays an overall better agreement with ab initio results, which reflects the role of the Coulomb field in the ionization as well as in the recombination process. Furthermore, it is found that the widely used SPSFA breaks down for low-order harmonic generation; i.e., the approximation turns out to be accurate only in the outer part of the harmonic plateau region as well as in the cutoff region. We trace this deficiency to the singularity of the SPSFA associated with short trajectories, i.e., short return times. When removing these, we obtain a version of the SPSFA which works rather well for the entire harmonic spectrum.
Fil: Pugliese, Silvina Norma. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Comisión Nacional de Energía Atómica. Centro Atómico Bariloche; Argentina
Fil: Simonsen, A. S.. University Of Bergen; Noruega
Fil: Førre, M.. University Of Bergen; Noruega
Fil: Hansen, J. P.. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. University Of Bergen; Noruega. Comisión Nacional de Energía Atómica. Centro Atómico Bariloche; Argentina
description We compare harmonic spectra from hydrogen based on the numerical solution of the time-dependent Schrödinger equation and three approximate models: (i) the strong field approximation (SFA), (ii) the Coulomb-Volkov modified strong field approximation (CVA), and (iii) the strong field approximation with the stationary phase approximation applied to the momentum integrals (SPSFA). At laser intensities in the range of (1-3)×1014W/cm2 we find good agreement when comparing the SFA and CVA with exact results. In general the CVA displays an overall better agreement with ab initio results, which reflects the role of the Coulomb field in the ionization as well as in the recombination process. Furthermore, it is found that the widely used SPSFA breaks down for low-order harmonic generation; i.e., the approximation turns out to be accurate only in the outer part of the harmonic plateau region as well as in the cutoff region. We trace this deficiency to the singularity of the SPSFA associated with short trajectories, i.e., short return times. When removing these, we obtain a version of the SPSFA which works rather well for the entire harmonic spectrum.
publishDate 2015
dc.date.none.fl_str_mv 2015-08
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
http://purl.org/coar/resource_type/c_6501
info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/11336/54941
Pugliese, Silvina Norma; Simonsen, A. S.; Førre, M.; Hansen, J. P.; High-order-harmonic spectra from atoms in intense laser fields: Exact versus approximate methods; American Physical Society; Physical Review A: Atomic, Molecular and Optical Physics; 92; 2; 8-2015; 023424-1-023424-8
1050-2947
CONICET Digital
CONICET
url http://hdl.handle.net/11336/54941
identifier_str_mv Pugliese, Silvina Norma; Simonsen, A. S.; Førre, M.; Hansen, J. P.; High-order-harmonic spectra from atoms in intense laser fields: Exact versus approximate methods; American Physical Society; Physical Review A: Atomic, Molecular and Optical Physics; 92; 2; 8-2015; 023424-1-023424-8
1050-2947
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/doi/10.1103/PhysRevA.92.023424
info:eu-repo/semantics/altIdentifier/url/https://journals.aps.org/pra/abstract/10.1103/PhysRevA.92.023424
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.format.none.fl_str_mv application/pdf
application/pdf
application/pdf
dc.publisher.none.fl_str_mv American Physical Society
publisher.none.fl_str_mv American Physical Society
dc.source.none.fl_str_mv reponame:CONICET Digital (CONICET)
instname:Consejo Nacional de Investigaciones Científicas y Técnicas
reponame_str CONICET Digital (CONICET)
collection CONICET Digital (CONICET)
instname_str Consejo Nacional de Investigaciones Científicas y Técnicas
repository.name.fl_str_mv CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas
repository.mail.fl_str_mv dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar
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score 12.993085

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