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Subcycle Phase Matching Effects in Short Attosecond Pulse Trains

Ouahioune, Nedjma LU orcid ; Martin-Hernández, Rodrigo ; Hoff, Dominik LU ; Maroju, Praveen Kumar LU ; Guo, Chen LU ; Weissenbilder, Robin LU ; Mikaelsson, Sara LU ; Lhuillier, A LU orcid ; Lucchini, Matteo and Arnold, Cord LU , et al. (2026) In Ultrafast Science 6.
Abstract
Attosecond pulses produced by high-order harmonic generation in gases driven by intense laser fields have become a cornerstone technique for probing ultrafast electronic motion in matter. These applications require a good knowledge of the temporal and spectral properties of the emitted radiation. In this work, we generate a train of two to three attosecond pulses that we characterize using two-color laser-assisted photoionization. An unexpected spectral behavior, with more pulses at high energies than at low energies, is observed when the carrier-to-envelope phase of the laser field is changed by 90°. High-order harmonic generation simulations indicate that the time-dependent phase matching of the harmonics contributes in a nontrivial way... (More)
Attosecond pulses produced by high-order harmonic generation in gases driven by intense laser fields have become a cornerstone technique for probing ultrafast electronic motion in matter. These applications require a good knowledge of the temporal and spectral properties of the emitted radiation. In this work, we generate a train of two to three attosecond pulses that we characterize using two-color laser-assisted photoionization. An unexpected spectral behavior, with more pulses at high energies than at low energies, is observed when the carrier-to-envelope phase of the laser field is changed by 90°. High-order harmonic generation simulations indicate that the time-dependent phase matching of the harmonics contributes in a nontrivial way to the structure of the pulse train. Two-color laser-assisted photoionization enables us to unravel the dynamical influence of subcycle phase matching on the spectral properties of the attosecond pulse train, going beyond the predictions of the response of a single atom to a strong laser field. (Less)
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organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
High-order Harmonic Generation, Laser-Assisted Photoionization, Attosecond, Phase matching
in
Ultrafast Science
volume
6
article number
0154
publisher
American Association for the Advancement of Science (AAAS)
external identifiers
  • scopus:105039889557
ISSN
2765-8791
DOI
10.34133/ultrafastscience.0154
language
English
LU publication?
yes
id
0d035140-68b4-4b8d-bf4b-c0c3bd4c19ed
date added to LUP
2026-06-04 15:43:38
date last changed
2026-06-06 03:27:22
@article{0d035140-68b4-4b8d-bf4b-c0c3bd4c19ed,
  abstract     = {{Attosecond pulses produced by high-order harmonic generation in gases driven by intense laser fields have become a cornerstone technique for probing ultrafast electronic motion in matter. These applications require a good knowledge of the temporal and spectral properties of the emitted radiation. In this work, we generate a train of two to three attosecond pulses that we characterize using two-color laser-assisted photoionization. An unexpected spectral behavior, with more pulses at high energies than at low energies, is observed when the carrier-to-envelope phase of the laser field is changed by 90°. High-order harmonic generation simulations indicate that the time-dependent phase matching of the harmonics contributes in a nontrivial way to the structure of the pulse train. Two-color laser-assisted photoionization enables us to unravel the dynamical influence of subcycle phase matching on the spectral properties of the attosecond pulse train, going beyond the predictions of the response of a single atom to a strong laser field.}},
  author       = {{Ouahioune, Nedjma and Martin-Hernández, Rodrigo and Hoff, Dominik and Maroju, Praveen Kumar and Guo, Chen and Weissenbilder, Robin and Mikaelsson, Sara and Lhuillier, A and Lucchini, Matteo and Arnold, Cord and Gisselbrecht, Mathieu}},
  issn         = {{2765-8791}},
  keywords     = {{High-order Harmonic Generation; Laser-Assisted Photoionization; Attosecond; Phase matching}},
  language     = {{eng}},
  month        = {{05}},
  publisher    = {{American Association for the Advancement of Science (AAAS)}},
  series       = {{Ultrafast Science}},
  title        = {{Subcycle Phase Matching Effects in Short Attosecond Pulse Trains}},
  url          = {{http://dx.doi.org/10.34133/ultrafastscience.0154}},
  doi          = {{10.34133/ultrafastscience.0154}},
  volume       = {{6}},
  year         = {{2026}},
}