---
_id: '13998'
abstract:
- lang: eng
  text: The interaction of strong near-infrared (NIR) laser pulses with wide-bandgap
    dielectrics produces high harmonics in the extreme ultraviolet (XUV) wavelength
    range. These observations have opened up the possibility of attosecond metrology
    in solids, which would benefit from a precise measurement of the emission times
    of individual harmonics with respect to the NIR laser field. Here we show that,
    when high-harmonics are detected from the input surface of a magnesium oxide crystal,
    a bichromatic probing of the XUV emission shows a clear synchronization largely
    consistent with a semiclassical model of electron–hole recollisions in bulk solids.
    On the other hand, the bichromatic spectrogram of harmonics originating from the
    exit surface of the 200 μm-thick crystal is strongly modified, indicating the
    influence of laser field distortions during propagation. Our tracking of sub-cycle
    electron and hole re-collisions at XUV energies is relevant to the development
    of solid-state sources of attosecond pulses.
article_number: '144003'
article_processing_charge: No
article_type: original
arxiv: 1
author:
- first_name: Giulio
  full_name: Vampa, Giulio
  last_name: Vampa
- first_name: Jian
  full_name: Lu, Jian
  last_name: Lu
- first_name: Yong Sing
  full_name: You, Yong Sing
  last_name: You
- first_name: Denitsa Rangelova
  full_name: Baykusheva, Denitsa Rangelova
  id: 71b4d059-2a03-11ee-914d-dfa3beed6530
  last_name: Baykusheva
- first_name: Mengxi
  full_name: Wu, Mengxi
  last_name: Wu
- first_name: Hanzhe
  full_name: Liu, Hanzhe
  last_name: Liu
- first_name: Kenneth J
  full_name: Schafer, Kenneth J
  last_name: Schafer
- first_name: Mette B
  full_name: Gaarde, Mette B
  last_name: Gaarde
- first_name: David A
  full_name: Reis, David A
  last_name: Reis
- first_name: Shambhu
  full_name: Ghimire, Shambhu
  last_name: Ghimire
citation:
  ama: 'Vampa G, Lu J, You YS, et al. Attosecond synchronization of extreme ultraviolet
    high harmonics from crystals. <i>Journal of Physics B: Atomic, Molecular and Optical
    Physics</i>. 2020;53(14). doi:<a href="https://doi.org/10.1088/1361-6455/ab8e56">10.1088/1361-6455/ab8e56</a>'
  apa: 'Vampa, G., Lu, J., You, Y. S., Baykusheva, D. R., Wu, M., Liu, H., … Ghimire,
    S. (2020). Attosecond synchronization of extreme ultraviolet high harmonics from
    crystals. <i>Journal of Physics B: Atomic, Molecular and Optical Physics</i>.
    IOP Publishing. <a href="https://doi.org/10.1088/1361-6455/ab8e56">https://doi.org/10.1088/1361-6455/ab8e56</a>'
  chicago: 'Vampa, Giulio, Jian Lu, Yong Sing You, Denitsa Rangelova Baykusheva, Mengxi
    Wu, Hanzhe Liu, Kenneth J Schafer, Mette B Gaarde, David A Reis, and Shambhu Ghimire.
    “Attosecond Synchronization of Extreme Ultraviolet High Harmonics from Crystals.”
    <i>Journal of Physics B: Atomic, Molecular and Optical Physics</i>. IOP Publishing,
    2020. <a href="https://doi.org/10.1088/1361-6455/ab8e56">https://doi.org/10.1088/1361-6455/ab8e56</a>.'
  ieee: 'G. Vampa <i>et al.</i>, “Attosecond synchronization of extreme ultraviolet
    high harmonics from crystals,” <i>Journal of Physics B: Atomic, Molecular and
    Optical Physics</i>, vol. 53, no. 14. IOP Publishing, 2020.'
  ista: 'Vampa G, Lu J, You YS, Baykusheva DR, Wu M, Liu H, Schafer KJ, Gaarde MB,
    Reis DA, Ghimire S. 2020. Attosecond synchronization of extreme ultraviolet high
    harmonics from crystals. Journal of Physics B: Atomic, Molecular and Optical Physics.
    53(14), 144003.'
  mla: 'Vampa, Giulio, et al. “Attosecond Synchronization of Extreme Ultraviolet High
    Harmonics from Crystals.” <i>Journal of Physics B: Atomic, Molecular and Optical
    Physics</i>, vol. 53, no. 14, 144003, IOP Publishing, 2020, doi:<a href="https://doi.org/10.1088/1361-6455/ab8e56">10.1088/1361-6455/ab8e56</a>.'
  short: 'G. Vampa, J. Lu, Y.S. You, D.R. Baykusheva, M. Wu, H. Liu, K.J. Schafer,
    M.B. Gaarde, D.A. Reis, S. Ghimire, Journal of Physics B: Atomic, Molecular and
    Optical Physics 53 (2020).'
date_created: 2023-08-09T13:09:51Z
date_published: 2020-06-17T00:00:00Z
date_updated: 2023-08-22T07:36:36Z
day: '17'
doi: 10.1088/1361-6455/ab8e56
extern: '1'
external_id:
  arxiv:
  - '2001.09951'
intvolume: '        53'
issue: '14'
keyword:
- Condensed Matter Physics
- Atomic and Molecular Physics
- and Optics
language:
- iso: eng
main_file_link:
- open_access: '1'
  url: https://arxiv.org/abs/2001.09951
month: '06'
oa: 1
oa_version: Preprint
publication: 'Journal of Physics B: Atomic, Molecular and Optical Physics'
publication_identifier:
  eissn:
  - 1361-6455
  issn:
  - 0953-4075
publication_status: published
publisher: IOP Publishing
quality_controlled: '1'
scopus_import: '1'
status: public
title: Attosecond synchronization of extreme ultraviolet high harmonics from crystals
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 53
year: '2020'
...
---
_id: '14007'
abstract:
- lang: eng
  text: 'In a recent article by Hockett et al (2016 J. Phys. B: At. Mol. Opt. Phys.
    49 095602), time delays arising in the context of molecular single-photon ionization
    are investigated from a theoretical point of view. We argue that one of the central
    equations given in this article is incorrect and present a reformulation that
    is consistent with the established treatment of angle-dependent scattering delays
    (Eisenbud 1948 PhD Thesis Princeton University; Wigner 1955 Phys. Rev. 98 145–7;
    Smith 1960 Phys. Rev. 118 349–6; Nussenzveig 1972 Phys. Rev. D 6 1534–42).'
article_number: '078002'
article_processing_charge: No
article_type: letter_note
arxiv: 1
author:
- first_name: Denitsa Rangelova
  full_name: Baykusheva, Denitsa Rangelova
  id: 71b4d059-2a03-11ee-914d-dfa3beed6530
  last_name: Baykusheva
- first_name: Hans Jakob
  full_name: Wörner, Hans Jakob
  last_name: Wörner
citation:
  ama: 'Baykusheva DR, Wörner HJ. Comment on ‘Time delays in molecular photoionization.’
    <i>Journal of Physics B: Atomic, Molecular and Optical Physics</i>. 2017;50(7).
    doi:<a href="https://doi.org/10.1088/1361-6455/aa62b5">10.1088/1361-6455/aa62b5</a>'
  apa: 'Baykusheva, D. R., &#38; Wörner, H. J. (2017). Comment on ‘Time delays in
    molecular photoionization.’ <i>Journal of Physics B: Atomic, Molecular and Optical
    Physics</i>. IOP Publishing. <a href="https://doi.org/10.1088/1361-6455/aa62b5">https://doi.org/10.1088/1361-6455/aa62b5</a>'
  chicago: 'Baykusheva, Denitsa Rangelova, and Hans Jakob Wörner. “Comment on ‘Time
    Delays in Molecular Photoionization.’” <i>Journal of Physics B: Atomic, Molecular
    and Optical Physics</i>. IOP Publishing, 2017. <a href="https://doi.org/10.1088/1361-6455/aa62b5">https://doi.org/10.1088/1361-6455/aa62b5</a>.'
  ieee: 'D. R. Baykusheva and H. J. Wörner, “Comment on ‘Time delays in molecular
    photoionization,’” <i>Journal of Physics B: Atomic, Molecular and Optical Physics</i>,
    vol. 50, no. 7. IOP Publishing, 2017.'
  ista: 'Baykusheva DR, Wörner HJ. 2017. Comment on ‘Time delays in molecular photoionization’.
    Journal of Physics B: Atomic, Molecular and Optical Physics. 50(7), 078002.'
  mla: 'Baykusheva, Denitsa Rangelova, and Hans Jakob Wörner. “Comment on ‘Time Delays
    in Molecular Photoionization.’” <i>Journal of Physics B: Atomic, Molecular and
    Optical Physics</i>, vol. 50, no. 7, 078002, IOP Publishing, 2017, doi:<a href="https://doi.org/10.1088/1361-6455/aa62b5">10.1088/1361-6455/aa62b5</a>.'
  short: 'D.R. Baykusheva, H.J. Wörner, Journal of Physics B: Atomic, Molecular and
    Optical Physics 50 (2017).'
date_created: 2023-08-10T06:36:29Z
date_published: 2017-03-15T00:00:00Z
date_updated: 2023-08-22T08:32:43Z
day: '15'
doi: 10.1088/1361-6455/aa62b5
extern: '1'
external_id:
  arxiv:
  - '1611.09352'
intvolume: '        50'
issue: '7'
keyword:
- Condensed Matter Physics
- Atomic and Molecular Physics
- and Optics
language:
- iso: eng
main_file_link:
- open_access: '1'
  url: https://arxiv.org/abs/1611.09352
month: '03'
oa: 1
oa_version: Preprint
publication: 'Journal of Physics B: Atomic, Molecular and Optical Physics'
publication_identifier:
  eissn:
  - 1361-6455
  issn:
  - 0953-4075
publication_status: published
publisher: IOP Publishing
quality_controlled: '1'
scopus_import: '1'
status: public
title: Comment on ‘Time delays in molecular photoionization’
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 50
year: '2017'
...
---
_id: '14021'
abstract:
- lang: eng
  text: We present the detailed analysis of a new two-pulse orientation scheme that
    achieves macroscopic field-free orientation at the high particle densities required
    for attosecond and high-harmonic spectroscopies (Kraus et al 2013 arXiv:1311.3923).
    Carbon monoxide molecules are oriented by combining one-colour and delayed two-colour
    non-resonant femtosecond laser pulses. High-harmonic generation is used to probe
    the oriented wave-packet dynamics and reveals that a very high degree of orientation
    (Nup/Ntotal = 0.73–0.82) is achieved. We further extend this approach to orienting
    carbonyl sulphide molecules. We show that the present two-pulse scheme selectively
    enhances orientation created by the hyperpolarizability interaction whereas the
    ionization-depletion mechanism plays no role. We further control and optimize
    orientation through the delay between the one- and two-colour pump pulses. Finally,
    we demonstrate a complementary encoding of electronic-structure features, such
    as shape resonances, in the even- and odd-harmonic spectrum. The achieved progress
    makes two-pulse field-free orientation an attractive tool for a broad class of
    time-resolved measurements.
article_number: '124030'
article_processing_charge: No
article_type: original
arxiv: 1
author:
- first_name: P M
  full_name: Kraus, P M
  last_name: Kraus
- first_name: Denitsa Rangelova
  full_name: Baykusheva, Denitsa Rangelova
  id: 71b4d059-2a03-11ee-914d-dfa3beed6530
  last_name: Baykusheva
- first_name: H J
  full_name: Wörner, H J
  last_name: Wörner
citation:
  ama: 'Kraus PM, Baykusheva DR, Wörner HJ. Two-pulse orientation dynamics and high-harmonic
    spectroscopy of strongly-oriented molecules. <i>Journal of Physics B: Atomic,
    Molecular and Optical Physics</i>. 2014;47(12). doi:<a href="https://doi.org/10.1088/0953-4075/47/12/124030">10.1088/0953-4075/47/12/124030</a>'
  apa: 'Kraus, P. M., Baykusheva, D. R., &#38; Wörner, H. J. (2014). Two-pulse orientation
    dynamics and high-harmonic spectroscopy of strongly-oriented molecules. <i>Journal
    of Physics B: Atomic, Molecular and Optical Physics</i>. IOP Publishing. <a href="https://doi.org/10.1088/0953-4075/47/12/124030">https://doi.org/10.1088/0953-4075/47/12/124030</a>'
  chicago: 'Kraus, P M, Denitsa Rangelova Baykusheva, and H J Wörner. “Two-Pulse Orientation
    Dynamics and High-Harmonic Spectroscopy of Strongly-Oriented Molecules.” <i>Journal
    of Physics B: Atomic, Molecular and Optical Physics</i>. IOP Publishing, 2014.
    <a href="https://doi.org/10.1088/0953-4075/47/12/124030">https://doi.org/10.1088/0953-4075/47/12/124030</a>.'
  ieee: 'P. M. Kraus, D. R. Baykusheva, and H. J. Wörner, “Two-pulse orientation dynamics
    and high-harmonic spectroscopy of strongly-oriented molecules,” <i>Journal of
    Physics B: Atomic, Molecular and Optical Physics</i>, vol. 47, no. 12. IOP Publishing,
    2014.'
  ista: 'Kraus PM, Baykusheva DR, Wörner HJ. 2014. Two-pulse orientation dynamics
    and high-harmonic spectroscopy of strongly-oriented molecules. Journal of Physics
    B: Atomic, Molecular and Optical Physics. 47(12), 124030.'
  mla: 'Kraus, P. M., et al. “Two-Pulse Orientation Dynamics and High-Harmonic Spectroscopy
    of Strongly-Oriented Molecules.” <i>Journal of Physics B: Atomic, Molecular and
    Optical Physics</i>, vol. 47, no. 12, 124030, IOP Publishing, 2014, doi:<a href="https://doi.org/10.1088/0953-4075/47/12/124030">10.1088/0953-4075/47/12/124030</a>.'
  short: 'P.M. Kraus, D.R. Baykusheva, H.J. Wörner, Journal of Physics B: Atomic,
    Molecular and Optical Physics 47 (2014).'
date_created: 2023-08-10T06:38:48Z
date_published: 2014-06-10T00:00:00Z
date_updated: 2023-08-22T09:04:30Z
day: '10'
doi: 10.1088/0953-4075/47/12/124030
extern: '1'
external_id:
  arxiv:
  - '1311.3923'
intvolume: '        47'
issue: '12'
keyword:
- Condensed Matter Physics
- Atomic and Molecular Physics
- and Optics
language:
- iso: eng
main_file_link:
- open_access: '1'
  url: https://arxiv.org/abs/1311.3923
month: '06'
oa: 1
oa_version: Preprint
publication: 'Journal of Physics B: Atomic, Molecular and Optical Physics'
publication_identifier:
  eissn:
  - 1361-6455
  issn:
  - 0953-4075
publication_status: published
publisher: IOP Publishing
quality_controlled: '1'
scopus_import: '1'
status: public
title: Two-pulse orientation dynamics and high-harmonic spectroscopy of strongly-oriented
  molecules
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 47
year: '2014'
...