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Angular distributions of high-order harmonics generated by a femtosecond laser

Salieres, P; Ditmire, T; Perry, M. D; L'Huillier, Anne LU and Lewenstein, M (1996) In Journal of Physics B: Atomic, Molecular and Optical Physics 29(20). p.4771-4786
Abstract
We present a systematic study of the angular distributions of high-order harmonics generated with a femtosecond Cr:LiSrAlF6 laser. We investigate the influence of different parameters, namely laser intensity, nonlinear order, nature of the gas and position of the laser focus relative to the generating medium. We show that when the laser is focused before the atomic medium, harmonics with regular spatial profiles can be generated with reasonable conversion efficiency. Their divergence does not depend directly on the nonlinear order, the intensity or even the nature of the generating gas, but rather on the region of the spectrum the considered harmonic belongs to, which is determined by the combination of the three preceding elements. When... (More)
We present a systematic study of the angular distributions of high-order harmonics generated with a femtosecond Cr:LiSrAlF6 laser. We investigate the influence of different parameters, namely laser intensity, nonlinear order, nature of the gas and position of the laser focus relative to the generating medium. We show that when the laser is focused before the atomic medium, harmonics with regular spatial profiles can be generated with reasonable conversion efficiency. Their divergence does not depend directly on the nonlinear order, the intensity or even the nature of the generating gas, but rather on the region of the spectrum the considered harmonic belongs to, which is determined by the combination of the three preceding elements. When the focus is drawn closer to the medium, the distributions get increasingly distorted, becoming annular with a significant divergence for a focus right into-or after-the jet. We perform numerical simulations of the angular distributions. The simulated profiles reproduce remarkably well the experimental trends and are thus used to interpret them. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Journal of Physics B: Atomic, Molecular and Optical Physics
volume
29
issue
20
pages
4771 - 4786
publisher
IOP Publishing
external identifiers
  • Scopus:0001280942
ISSN
0953-4075
DOI
10.1088/0953-4075/29/20/027
language
English
LU publication?
yes
id
8a65fc2c-edba-40f3-ace9-80e194a93b21 (old id 2259243)
date added to LUP
2012-02-10 00:33:49
date last changed
2017-01-01 07:54:44
@article{8a65fc2c-edba-40f3-ace9-80e194a93b21,
  abstract     = {We present a systematic study of the angular distributions of high-order harmonics generated with a femtosecond Cr:LiSrAlF6 laser. We investigate the influence of different parameters, namely laser intensity, nonlinear order, nature of the gas and position of the laser focus relative to the generating medium. We show that when the laser is focused before the atomic medium, harmonics with regular spatial profiles can be generated with reasonable conversion efficiency. Their divergence does not depend directly on the nonlinear order, the intensity or even the nature of the generating gas, but rather on the region of the spectrum the considered harmonic belongs to, which is determined by the combination of the three preceding elements. When the focus is drawn closer to the medium, the distributions get increasingly distorted, becoming annular with a significant divergence for a focus right into-or after-the jet. We perform numerical simulations of the angular distributions. The simulated profiles reproduce remarkably well the experimental trends and are thus used to interpret them.},
  author       = {Salieres, P and Ditmire, T and Perry, M. D and L'Huillier, Anne and Lewenstein, M},
  issn         = {0953-4075},
  language     = {eng},
  number       = {20},
  pages        = {4771--4786},
  publisher    = {IOP Publishing},
  series       = {Journal of Physics B: Atomic, Molecular and Optical Physics},
  title        = {Angular distributions of high-order harmonics generated by a femtosecond laser},
  url          = {http://dx.doi.org/10.1088/0953-4075/29/20/027},
  volume       = {29},
  year         = {1996},
}