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Phys. Rev. A 59, 1367 - 1373 (1999)

Spatiotemporal separation of high harmonic radiation into two quantum path components

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M. B. Gaarde1,2, F. Salin3, E. Constant3, Ph. Balcou4, K. J. Schafer5, K. C. Kulander6, and A. L’Huillier1
1Department of Physics, Lund Institute of Technology, P.O. Box 118, S-22100 Lund, Sweden
2Niels Bohr Institute, Ørsted Laboratory, Universitetsparken 5, 2100 Copenhagen Ø, Denmark
3CPMOH/ELIA, Université Bordeaux 1, 351 Cours de la Libération, 33405 Talence Cedex, France
4Laboratoire d’Optique Appliquée, ENSTA, Ecole Polytechnique, Unité Mixte de Recherches 7639, Centre National de la Recherche Scientifique, 91761 Palaiseau Cedex, France
5Department of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana 70803-4001
6TAMP Group, Lawrence Livermore National Laboratory, Livermore, California 94551

Received 4 August 1998

We present a spatiotemporal analysis of high harmonic generation, showing evidence for the presence of several quantum path contributions to the atomic dipole moment. We show that the harmonic radiation can largely be described as a sum of two fields having a phase proportional to the intensity of the generating field. We compare our results to recent experimental results demonstrating this separation [M. Bellini et al., Phys. Rev. Lett. 81, 297 (1998)]. We show how the temporal and spatial coherence properties are influenced by this effect, and discuss how it could be used to obtain better control of the generated harmonic radiation.


©1999 The American Physical Society

URL: http://link.aps.org/doi/10.1103/PhysRevA.59.1367
DOI: 10.1103/PhysRevA.59.1367
PACS: 32.80.Rm, 42.65.Ky

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