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High-order harmonic generation in xenon : Intensity and propagation effects

Lompré, L. A. ; L’ Huillier, A. LU orcid ; Ferray, M. ; Monot, P. ; Mainfray, G. and Manus, C. (1990) In Journal of the Optical Society of America B: Optical Physics 7(5). p.754-761
Abstract

We present experimental results on high-order harmonic generation in xenon, using a Nd:YAG laser (1064 nm). The harmonic generation efficiency is studied as a function of the laser intensity in the 1013 W/cm2 range. The harmonic conversion rates show a significant change of behavior when the medium becomes ionized (∼1013 W/cm2). This effect can be understood as the change of the nonlinear response of the medium from neutral atoms to ions and also as the influence of free electrons. We study the role of propagation effects (phase matching) by performing experiments using three different lenses (75, 200, and 300 mm) to focus the incident laser beam, thus changing the interaction geometry.... (More)

We present experimental results on high-order harmonic generation in xenon, using a Nd:YAG laser (1064 nm). The harmonic generation efficiency is studied as a function of the laser intensity in the 1013 W/cm2 range. The harmonic conversion rates show a significant change of behavior when the medium becomes ionized (∼1013 W/cm2). This effect can be understood as the change of the nonlinear response of the medium from neutral atoms to ions and also as the influence of free electrons. We study the role of propagation effects (phase matching) by performing experiments using three different lenses (75, 200, and 300 mm) to focus the incident laser beam, thus changing the interaction geometry. Although for each harmonic the conversion rate is strongly dependent on the confocal parameter b (as b3), the behavior of the harmonic frequency distribution shows almost no influence of the focusing geometry.

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publishing date
type
Contribution to journal
publication status
published
subject
in
Journal of the Optical Society of America B: Optical Physics
volume
7
issue
5
pages
8 pages
publisher
Optical Society of America
external identifiers
  • scopus:0041506211
ISSN
0740-3224
DOI
10.1364/JOSAB.7.000754
language
English
LU publication?
no
id
02ea7a81-fa4a-4296-96aa-3da62a5d39f4
date added to LUP
2019-05-22 17:46:18
date last changed
2021-01-03 05:01:45
@article{02ea7a81-fa4a-4296-96aa-3da62a5d39f4,
  abstract     = {{<p>We present experimental results on high-order harmonic generation in xenon, using a Nd:YAG laser (1064 nm). The harmonic generation efficiency is studied as a function of the laser intensity in the 10<sup>13</sup> W/cm<sup>2</sup> range. The harmonic conversion rates show a significant change of behavior when the medium becomes ionized (∼10<sup>13</sup> W/cm<sup>2</sup>). This effect can be understood as the change of the nonlinear response of the medium from neutral atoms to ions and also as the influence of free electrons. We study the role of propagation effects (phase matching) by performing experiments using three different lenses (75, 200, and 300 mm) to focus the incident laser beam, thus changing the interaction geometry. Although for each harmonic the conversion rate is strongly dependent on the confocal parameter b (as b<sup>3</sup>), the behavior of the harmonic frequency distribution shows almost no influence of the focusing geometry.</p>}},
  author       = {{Lompré, L. A. and L’ Huillier, A. and Ferray, M. and Monot, P. and Mainfray, G. and Manus, C.}},
  issn         = {{0740-3224}},
  language     = {{eng}},
  number       = {{5}},
  pages        = {{754--761}},
  publisher    = {{Optical Society of America}},
  series       = {{Journal of the Optical Society of America B: Optical Physics}},
  title        = {{High-order harmonic generation in xenon : Intensity and propagation effects}},
  url          = {{http://dx.doi.org/10.1364/JOSAB.7.000754}},
  doi          = {{10.1364/JOSAB.7.000754}},
  volume       = {{7}},
  year         = {{1990}},
}