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Generalized phase-m...
Generalized phase-matching conditions for high harmonics : The role of field-gradient forces
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- Balcou, Philippe (author)
- Laboratoire d'Electronique Quantique,Sorbonne Paris Nord University
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- Sali`eres, Pascal (author)
- Saclay Nuclear Research Centre (CEA Saclay)
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- L'Huillier, Anne (author)
- Lund University,Lunds universitet,Fysiska institutionen,Institutioner vid LTH,Lunds Tekniska Högskola,Department of Physics,Departments at LTH,Faculty of Engineering, LTH
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- Lewenstein, Maciej (author)
- Saclay Nuclear Research Centre (CEA Saclay)
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(creator_code:org_t)
- 1997
- 1997
- English 7 s.
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In: Physical Review A (Atomic, Molecular and Optical Physics). - 1050-2947. ; 55:4, s. 3204-3210
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Abstract
Subject headings
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- We present an approach to describe the phase matching of high harmonics emitted by laser driven atoms in a nonperturbative regime, for which the atomic response displays an intrinsic intensity-dependent phase. We show that the traditional phase-matching conditions involving conservation of wave vectors should be modified by taking into account the gradient of this atomic phase. We investigate various focusing geometries and interpret the numerical results of Sali`eres et al. [Phys. Rev. Lett. 74, 3776 (1995)]. Within the framework of the two-step model, we demonstrate that the gradient of the intensity-dependent phase can be considered as the canonical momentum gained by the electron in the continuum due to acceleration by field-gradient forces, including in particular the ponderomotive force.
Subject headings
- NATURVETENSKAP -- Fysik -- Atom- och molekylfysik och optik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Atom and Molecular Physics and Optics (hsv//eng)
Publication and Content Type
- art (subject category)
- ref (subject category)
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