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Tunable high-harmonic generation by chromatic focusing of few-cycle laser pulses

Holgado, W.; Hernández-García, C.; Alonso, B.; Miranda, M. LU ; Silva, F.; Varela, O.; Hernández-Toro, J.; Plaja, L.; Crespo, H. and Sola, I. J. (2017) In Physical Review A 95(6).
Abstract

In this work we study the impact of chromatic focusing of few-cycle laser pulses on high-order-harmonic generation (HHG) through analysis of the emitted extreme ultraviolet (XUV) radiation. Chromatic focusing is usually avoided in the few-cycle regime, as the pulse spatiotemporal structure may be highly distorted by the spatiotemporal aberrations. Here, however, we demonstrate it as an additional control parameter to modify the generated XUV radiation. We present experiments where few-cycle pulses are focused by a singlet lens in a Kr gas jet. The chromatic distribution of focal lengths allows us to tune HHG spectra by changing the relative singlet-target distance. Interestingly, we also show that the degree of chromatic aberration... (More)

In this work we study the impact of chromatic focusing of few-cycle laser pulses on high-order-harmonic generation (HHG) through analysis of the emitted extreme ultraviolet (XUV) radiation. Chromatic focusing is usually avoided in the few-cycle regime, as the pulse spatiotemporal structure may be highly distorted by the spatiotemporal aberrations. Here, however, we demonstrate it as an additional control parameter to modify the generated XUV radiation. We present experiments where few-cycle pulses are focused by a singlet lens in a Kr gas jet. The chromatic distribution of focal lengths allows us to tune HHG spectra by changing the relative singlet-target distance. Interestingly, we also show that the degree of chromatic aberration needed for this control does not degrade substantially the harmonic conversion efficiency, still allowing for the generation of supercontinua with the chirped-pulse scheme, demonstrated previously for achromatic focusing. We back up our experiments with theoretical simulations reproducing the experimental HHG results depending on diverse parameters (input pulse spectral phase, pulse duration, and focus position) and proving that, under the considered parameters, the attosecond pulse train remains very similar to the achromatic case, even showing cases of isolated attosecond pulse generation for near-single-cycle driving pulses.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Physical Review A
volume
95
issue
6
publisher
American Physical Society (APS)
external identifiers
  • scopus:85026796809
  • wos:000403344700013
ISSN
2469-9926
DOI
10.1103/PhysRevA.95.063823
language
English
LU publication?
yes
id
7db050ae-faa4-461c-b54e-0b5ba9148499
date added to LUP
2017-09-04 13:41:47
date last changed
2017-09-18 11:38:50
@article{7db050ae-faa4-461c-b54e-0b5ba9148499,
  abstract     = {<p>In this work we study the impact of chromatic focusing of few-cycle laser pulses on high-order-harmonic generation (HHG) through analysis of the emitted extreme ultraviolet (XUV) radiation. Chromatic focusing is usually avoided in the few-cycle regime, as the pulse spatiotemporal structure may be highly distorted by the spatiotemporal aberrations. Here, however, we demonstrate it as an additional control parameter to modify the generated XUV radiation. We present experiments where few-cycle pulses are focused by a singlet lens in a Kr gas jet. The chromatic distribution of focal lengths allows us to tune HHG spectra by changing the relative singlet-target distance. Interestingly, we also show that the degree of chromatic aberration needed for this control does not degrade substantially the harmonic conversion efficiency, still allowing for the generation of supercontinua with the chirped-pulse scheme, demonstrated previously for achromatic focusing. We back up our experiments with theoretical simulations reproducing the experimental HHG results depending on diverse parameters (input pulse spectral phase, pulse duration, and focus position) and proving that, under the considered parameters, the attosecond pulse train remains very similar to the achromatic case, even showing cases of isolated attosecond pulse generation for near-single-cycle driving pulses.</p>},
  articleno    = {063823},
  author       = {Holgado, W. and Hernández-García, C. and Alonso, B. and Miranda, M. and Silva, F. and Varela, O. and Hernández-Toro, J. and Plaja, L. and Crespo, H. and Sola, I. J.},
  issn         = {2469-9926},
  language     = {eng},
  month        = {06},
  number       = {6},
  publisher    = {American Physical Society (APS)},
  series       = {Physical Review A},
  title        = {Tunable high-harmonic generation by chromatic focusing of few-cycle laser pulses},
  url          = {http://dx.doi.org/10.1103/PhysRevA.95.063823},
  volume       = {95},
  year         = {2017},
}