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Spatiotemporal coupling of attosecond pulses

Wikmark, Hampus LU ; Guo, Chen LU ; Vogelsang, Jan LU ; Smorenburg, Peter W.; Coudert-Alteirac, Hélène LU ; Lahl, Jan LU ; Peschel, Jasper LU ; Rudawski, Piotr LU ; Dacasa, Hugo LU and Carlström, Stefanos LU , et al. (2019) In Proceedings of the National Academy of Sciences of the United States of America 116(11). p.4779-4787
Abstract

The shortest light pulses produced to date are of the order of a few tens of attoseconds, with central frequencies in the extreme UV range and bandwidths exceeding tens of electronvolts. They are often produced as a train of pulses separated by half the driving laser period, leading in the frequency domain to a spectrum of high, odd-order harmonics. As light pulses become shorter and more spectrally wide, the widely used approximation consisting of writing the optical waveform as a product of temporal and spatial amplitudes does not apply anymore. Here, we investigate the interplay of temporal and spatial properties of attosecond pulses. We show that the divergence and focus position of the generated harmonics often strongly depend on... (More)

The shortest light pulses produced to date are of the order of a few tens of attoseconds, with central frequencies in the extreme UV range and bandwidths exceeding tens of electronvolts. They are often produced as a train of pulses separated by half the driving laser period, leading in the frequency domain to a spectrum of high, odd-order harmonics. As light pulses become shorter and more spectrally wide, the widely used approximation consisting of writing the optical waveform as a product of temporal and spatial amplitudes does not apply anymore. Here, we investigate the interplay of temporal and spatial properties of attosecond pulses. We show that the divergence and focus position of the generated harmonics often strongly depend on their frequency, leading to strong chromatic aberrations of the broadband attosecond pulses. Our argument uses a simple analytical model based on Gaussian optics, numerical propagation calculations, and experimental harmonic divergence measurements. This effect needs to be considered for future applications requiring highquality focusing while retaining the broadband/ultrashort characteristics of the radiation.

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publication status
published
subject
keywords
Attosecond pulse, Focusing of XUV radiation, Gaussian optics, High-order harmonic generation, Spatiotemporal coupling
in
Proceedings of the National Academy of Sciences of the United States of America
volume
116
issue
11
pages
9 pages
publisher
National Acad Sciences
external identifiers
  • scopus:85062886029
ISSN
0027-8424
DOI
10.1073/pnas.1817626116
language
English
LU publication?
yes
id
eb09fae9-05aa-43a3-a0ec-2e33b20e7ecd
date added to LUP
2019-03-21 14:50:34
date last changed
2019-03-21 14:50:34
@article{eb09fae9-05aa-43a3-a0ec-2e33b20e7ecd,
  abstract     = {<p>The shortest light pulses produced to date are of the order of a few tens of attoseconds, with central frequencies in the extreme UV range and bandwidths exceeding tens of electronvolts. They are often produced as a train of pulses separated by half the driving laser period, leading in the frequency domain to a spectrum of high, odd-order harmonics. As light pulses become shorter and more spectrally wide, the widely used approximation consisting of writing the optical waveform as a product of temporal and spatial amplitudes does not apply anymore. Here, we investigate the interplay of temporal and spatial properties of attosecond pulses. We show that the divergence and focus position of the generated harmonics often strongly depend on their frequency, leading to strong chromatic aberrations of the broadband attosecond pulses. Our argument uses a simple analytical model based on Gaussian optics, numerical propagation calculations, and experimental harmonic divergence measurements. This effect needs to be considered for future applications requiring highquality focusing while retaining the broadband/ultrashort characteristics of the radiation.</p>},
  author       = {Wikmark, Hampus and Guo, Chen and Vogelsang, Jan and Smorenburg, Peter W. and Coudert-Alteirac, Hélène and Lahl, Jan and Peschel, Jasper and Rudawski, Piotr and Dacasa, Hugo and Carlström, Stefanos and MacLot, Sylvain and Gaarde, Mette B. and Johnsson, Per and Arnold, Cord L. and L'Huillier, Anne},
  issn         = {0027-8424},
  keyword      = {Attosecond pulse,Focusing of XUV radiation,Gaussian optics,High-order harmonic generation,Spatiotemporal coupling},
  language     = {eng},
  number       = {11},
  pages        = {4779--4787},
  publisher    = {National Acad Sciences},
  series       = {Proceedings of the National Academy of Sciences of the United States of America},
  title        = {Spatiotemporal coupling of attosecond pulses},
  url          = {http://dx.doi.org/10.1073/pnas.1817626116},
  volume       = {116},
  year         = {2019},
}