Enhancing and controlling single-atom high-harmonic generation spectra: a time-dependent density-functional scheme

High harmonic generation (HHG) provides a flexible framework for the development of coherent light sources in the extreme-ultraviolet and soft X-ray regimes. However it suffers from low conversion efficiencies as the control of the HHG spectral and temporal characteristics requires manipulating elec...

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Authors: Castro, A., Rubio, A., Gross, E.K.U.
Format: article
Status:Versión aceptada para publicación
Publication Date:2015
Country:España
Institution:Universidad de Zaragoza
Repository:Zaguán. Repositorio Digital de la Universidad de Zaragoza
OAI Identifier:oai:zaguan.unizar.es:60855
Online Access:http://zaguan.unizar.es/record/60855
Access Level:Open access
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spelling Enhancing and controlling single-atom high-harmonic generation spectra: a time-dependent density-functional schemeCastro, A.Rubio, A.Gross, E.K.U.High harmonic generation (HHG) provides a flexible framework for the development of coherent light sources in the extreme-ultraviolet and soft X-ray regimes. However it suffers from low conversion efficiencies as the control of the HHG spectral and temporal characteristics requires manipulating electron trajectories on attosecond time scale. The phase matching mechanism has been employed to selectively enhance specific quantum paths leading to HHG. A few important fundamental questions remain open, among those how much of the enhancement can be achieved by the single-emitter and what is the role of correlations (or the electronic structure) in the selectivity and control of HHG generation. Here we address those questions by examining computationally the possibility of optimizing the HHG spectrum of isolated hydrogen and helium atoms by shaping the slowly varying envelope of a 800 nm, 200-cycles long laser pulse. The spectra are computed with a fully quantum mechanical description, by explicitly computing the time-dependent dipole moment of the systems using a time-dependent density-functional approach (or the single-electron Schrödinger equation for the case of H), on top of a one-dimensional model. The sought optimization corresponds to the selective enhancement of single harmonics, which we find to be significant. This selectivity is entirely due to the single atom response, and not to any propagation or phase-matching effect. Moreover, we see that the electronic correlation plays a role in the determining the degree of optimization that can be obtained.2015info:eu-repo/semantics/articleinfo:eu-repo/semantics/acceptedVersionapplication/pdfhttp://zaguan.unizar.es/record/60855reponame:Zaguán. Repositorio Digital de la Universidad de Zaragozainstname:Universidad de ZaragozaInglésinfo:eu-repo/grantAgreement/ES/MINECO/FIS2013-46159-C3-1-Pinfo:eu-repo/grantAgreement/ES/MINECO/FIS2013-46159-C2-2-Pinfo:eu-repo/grantAgreement/EC/FP7/280879info:eu-repo/grantAgreement/EC/FP7/267374info:eu-repo/semantics/openAccessoai:zaguan.unizar.es:608552026-05-29T13:59:51Z
dc.title.none.fl_str_mv Enhancing and controlling single-atom high-harmonic generation spectra: a time-dependent density-functional scheme
title Enhancing and controlling single-atom high-harmonic generation spectra: a time-dependent density-functional scheme
spellingShingle Enhancing and controlling single-atom high-harmonic generation spectra: a time-dependent density-functional scheme
Castro, A.
title_short Enhancing and controlling single-atom high-harmonic generation spectra: a time-dependent density-functional scheme
title_full Enhancing and controlling single-atom high-harmonic generation spectra: a time-dependent density-functional scheme
title_fullStr Enhancing and controlling single-atom high-harmonic generation spectra: a time-dependent density-functional scheme
title_full_unstemmed Enhancing and controlling single-atom high-harmonic generation spectra: a time-dependent density-functional scheme
title_sort Enhancing and controlling single-atom high-harmonic generation spectra: a time-dependent density-functional scheme
dc.creator.none.fl_str_mv Castro, A.
Rubio, A.
Gross, E.K.U.
author Castro, A.
author_facet Castro, A.
Rubio, A.
Gross, E.K.U.
author_role author
author2 Rubio, A.
Gross, E.K.U.
author2_role author
author
description High harmonic generation (HHG) provides a flexible framework for the development of coherent light sources in the extreme-ultraviolet and soft X-ray regimes. However it suffers from low conversion efficiencies as the control of the HHG spectral and temporal characteristics requires manipulating electron trajectories on attosecond time scale. The phase matching mechanism has been employed to selectively enhance specific quantum paths leading to HHG. A few important fundamental questions remain open, among those how much of the enhancement can be achieved by the single-emitter and what is the role of correlations (or the electronic structure) in the selectivity and control of HHG generation. Here we address those questions by examining computationally the possibility of optimizing the HHG spectrum of isolated hydrogen and helium atoms by shaping the slowly varying envelope of a 800 nm, 200-cycles long laser pulse. The spectra are computed with a fully quantum mechanical description, by explicitly computing the time-dependent dipole moment of the systems using a time-dependent density-functional approach (or the single-electron Schrödinger equation for the case of H), on top of a one-dimensional model. The sought optimization corresponds to the selective enhancement of single harmonics, which we find to be significant. This selectivity is entirely due to the single atom response, and not to any propagation or phase-matching effect. Moreover, we see that the electronic correlation plays a role in the determining the degree of optimization that can be obtained.
publishDate 2015
dc.date.none.fl_str_mv 2015
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/acceptedVersion
format article
status_str acceptedVersion
dc.identifier.none.fl_str_mv http://zaguan.unizar.es/record/60855
url http://zaguan.unizar.es/record/60855
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv info:eu-repo/grantAgreement/ES/MINECO/FIS2013-46159-C3-1-P
info:eu-repo/grantAgreement/ES/MINECO/FIS2013-46159-C2-2-P
info:eu-repo/grantAgreement/EC/FP7/280879
info:eu-repo/grantAgreement/EC/FP7/267374
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv
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dc.source.none.fl_str_mv reponame:Zaguán. Repositorio Digital de la Universidad de Zaragoza
instname:Universidad de Zaragoza
instname_str Universidad de Zaragoza
reponame_str Zaguán. Repositorio Digital de la Universidad de Zaragoza
collection Zaguán. Repositorio Digital de la Universidad de Zaragoza
repository.name.fl_str_mv
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