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A cross-correlator-based timing tool for FemtoMAX

Kroon, David LU ; Nilsson, Eric LU ; Ahn, Byungnam LU ; Bertelli, M. ; Calarco, R. ; Clementsson, Isa LU ; De Simone, S. ; Ekström, J.C. ; Jurgilaitis, Andrius LU and Longo, M. , et al. (2025) In Journal of Synchrotron Radiation 32(4). p.1052-1058
Abstract
We report on the commissioning of an ultrafast timing diagnostic for measuring a time-offset signal between two different synchronized ultrashort light pulses. The method is based on sum-frequency generation in a nonlinear crystal. The setup is similar to an auto/cross-correlator setup. In this case, one of the beams is a relatively weak diagnostic beam of visible light from a bending magnet at FemtoMAX (106 photons pulse−1 in a 0.2 mm high and 5 mm wide beam) while the other is a relatively intense laser beam (200 µJ pulse−1) derived from the same laser that is used to pump the sample in pump/probe experiments. This enables online monitoring of the relative timing of a linear accelerator-based, short-pulse, hard X-ray source and a... (More)
We report on the commissioning of an ultrafast timing diagnostic for measuring a time-offset signal between two different synchronized ultrashort light pulses. The method is based on sum-frequency generation in a nonlinear crystal. The setup is similar to an auto/cross-correlator setup. In this case, one of the beams is a relatively weak diagnostic beam of visible light from a bending magnet at FemtoMAX (106 photons pulse−1 in a 0.2 mm high and 5 mm wide beam) while the other is a relatively intense laser beam (200 µJ pulse−1) derived from the same laser that is used to pump the sample in pump/probe experiments. This enables online monitoring of the relative timing of a linear accelerator-based, short-pulse, hard X-ray source and a synchronized visible laser. We show that for a <50 fs full width at half-maximum (FWHM) light pulse from the accelerator and a 50 fs (FWHM) long laser pulse, we can determine the relative timing of the two pulses with an accuracy below 30 fs in a time interval of 4 ps. The advantages and limitations of the method are discussed. (Less)
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organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Journal of Synchrotron Radiation
volume
32
issue
4
pages
1052 - 1058
publisher
International Union of Crystallography
external identifiers
  • pmid:40455640
  • scopus:105010841328
ISSN
1600-5775
DOI
10.1107/S1600577525003479
language
English
LU publication?
yes
id
5f5261a3-db6f-4abb-81b1-357bffba5f8f
date added to LUP
2025-10-27 10:32:35
date last changed
2025-10-28 04:01:04
@article{5f5261a3-db6f-4abb-81b1-357bffba5f8f,
  abstract     = {{We report on the commissioning of an ultrafast timing diagnostic for measuring a time-offset signal between two different synchronized ultrashort light pulses. The method is based on sum-frequency generation in a nonlinear crystal. The setup is similar to an auto/cross-correlator setup. In this case, one of the beams is a relatively weak diagnostic beam of visible light from a bending magnet at FemtoMAX (106 photons pulse−1 in a 0.2 mm high and 5 mm wide beam) while the other is a relatively intense laser beam (200 µJ pulse−1) derived from the same laser that is used to pump the sample in pump/probe experiments. This enables online monitoring of the relative timing of a linear accelerator-based, short-pulse, hard X-ray source and a synchronized visible laser. We show that for a &lt;50 fs full width at half-maximum (FWHM) light pulse from the accelerator and a 50 fs (FWHM) long laser pulse, we can determine the relative timing of the two pulses with an accuracy below 30 fs in a time interval of 4 ps. The advantages and limitations of the method are discussed.}},
  author       = {{Kroon, David and Nilsson, Eric and Ahn, Byungnam and Bertelli, M. and Calarco, R. and Clementsson, Isa and De Simone, S. and Ekström, J.C. and Jurgilaitis, Andrius and Longo, M. and Pham, Van-Thai and Larsson, Jörgen}},
  issn         = {{1600-5775}},
  language     = {{eng}},
  month        = {{06}},
  number       = {{4}},
  pages        = {{1052--1058}},
  publisher    = {{International Union of Crystallography}},
  series       = {{Journal of Synchrotron Radiation}},
  title        = {{A cross-correlator-based timing tool for FemtoMAX}},
  url          = {{http://dx.doi.org/10.1107/S1600577525003479}},
  doi          = {{10.1107/S1600577525003479}},
  volume       = {{32}},
  year         = {{2025}},
}