Quantifying Decoherence in Attosecond Metrology

Laser-dressed photoemission spectroscopy has established itself as the gold standard of attosecond temporal metrology. In this technique, the attosecond structure of an extreme-ultraviolet pulse is retrieved from the wave function of the electron wave packet released during photoionization. Here, we...

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Autores principales:	C. Bourassin-Bouchet, L. Barreau, V. Gruson, J.-F. Hergott, F. Quéré, P. Salières, T. Ruchon
Formato:	article
Lenguaje:	EN
Publicado:	American Physical Society 2020
Materias:	Physics QC1-999
Acceso en línea:	https://doaj.org/article/39a382234d454c3fab5a108e75d77c88
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id	oai:doaj.org-article:39a382234d454c3fab5a108e75d77c88
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spelling	oai:doaj.org-article:39a382234d454c3fab5a108e75d77c882021-12-02T15:36:14ZQuantifying Decoherence in Attosecond Metrology10.1103/PhysRevX.10.0310482160-3308https://doaj.org/article/39a382234d454c3fab5a108e75d77c882020-08-01T00:00:00Zhttp://doi.org/10.1103/PhysRevX.10.031048http://doi.org/10.1103/PhysRevX.10.031048https://doaj.org/toc/2160-3308Laser-dressed photoemission spectroscopy has established itself as the gold standard of attosecond temporal metrology. In this technique, the attosecond structure of an extreme-ultraviolet pulse is retrieved from the wave function of the electron wave packet released during photoionization. Here, we show that this electron wave packet should rather be described using the density matrix formalism, thus allowing one to account for all processes that can affect its coherence, from the attosecond pulse generation to the photoemission and the measurement processes. Using this approach, we reconstruct experimentally a partially coherent electron wave packet with a purity of 0.11 (1 for full coherence). Comparison with theoretical models then allows us to identify the origins of this decoherence and to overcome several limitations such as beam-line instabilities or spectrometer resolution. Furthermore, we show numerically how this method gives access to the coherence and eigencomponents of complex photoelectron wave packets. It thus goes beyond the current measurement of photoionization time delays and provides a general framework for the analysis and understanding of complex photoemission processes.C. Bourassin-BouchetL. BarreauV. GrusonJ.-F. HergottF. QuéréP. SalièresT. RuchonAmerican Physical SocietyarticlePhysicsQC1-999ENPhysical Review X, Vol 10, Iss 3, p 031048 (2020)
institution	DOAJ
collection	DOAJ
language	EN
topic	Physics QC1-999
spellingShingle	Physics QC1-999 C. Bourassin-Bouchet L. Barreau V. Gruson J.-F. Hergott F. Quéré P. Salières T. Ruchon Quantifying Decoherence in Attosecond Metrology
description	Laser-dressed photoemission spectroscopy has established itself as the gold standard of attosecond temporal metrology. In this technique, the attosecond structure of an extreme-ultraviolet pulse is retrieved from the wave function of the electron wave packet released during photoionization. Here, we show that this electron wave packet should rather be described using the density matrix formalism, thus allowing one to account for all processes that can affect its coherence, from the attosecond pulse generation to the photoemission and the measurement processes. Using this approach, we reconstruct experimentally a partially coherent electron wave packet with a purity of 0.11 (1 for full coherence). Comparison with theoretical models then allows us to identify the origins of this decoherence and to overcome several limitations such as beam-line instabilities or spectrometer resolution. Furthermore, we show numerically how this method gives access to the coherence and eigencomponents of complex photoelectron wave packets. It thus goes beyond the current measurement of photoionization time delays and provides a general framework for the analysis and understanding of complex photoemission processes.
format	article
author	C. Bourassin-Bouchet L. Barreau V. Gruson J.-F. Hergott F. Quéré P. Salières T. Ruchon
author_facet	C. Bourassin-Bouchet L. Barreau V. Gruson J.-F. Hergott F. Quéré P. Salières T. Ruchon
author_sort	C. Bourassin-Bouchet
title	Quantifying Decoherence in Attosecond Metrology
title_short	Quantifying Decoherence in Attosecond Metrology
title_full	Quantifying Decoherence in Attosecond Metrology
title_fullStr	Quantifying Decoherence in Attosecond Metrology
title_full_unstemmed	Quantifying Decoherence in Attosecond Metrology
title_sort	quantifying decoherence in attosecond metrology
publisher	American Physical Society
publishDate	2020
url	https://doaj.org/article/39a382234d454c3fab5a108e75d77c88
work_keys_str_mv	AT cbourassinbouchet quantifyingdecoherenceinattosecondmetrology AT lbarreau quantifyingdecoherenceinattosecondmetrology AT vgruson quantifyingdecoherenceinattosecondmetrology AT jfhergott quantifyingdecoherenceinattosecondmetrology AT fquere quantifyingdecoherenceinattosecondmetrology AT psalieres quantifyingdecoherenceinattosecondmetrology AT truchon quantifyingdecoherenceinattosecondmetrology
_version_	1718386346191486976

Quantifying Decoherence in Attosecond Metrology

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