Temporal coherence of high-order harmonics

C. Lyngå; M. B. Gaarde; C. Delfin; M. Bellini; T. W. Hänsch; A. L’ Huillier; C.-G. Wahlström

doi:10.1103/PhysRevA.60.4823

Temporal coherence of high-order harmonics

C. Lyngå, M. B. Gaarde, C. Delfin, M. Bellini, T. W. Hänsch, A. L’ Huillier, and C.-G. Wahlström

Phys. Rev. A 60, 4823 – Published 1 December 1999

Abstract

Systematic studies of the temporal coherence properties of high-order harmonic radiation are presented. These complement our previous investigations [Bellini et al., Phys. Rev. Lett. 81, 297 (1998)], where we showed the separation of the far-field pattern of high-order harmonics into two distinct spatial regions with different coherence times. Here we show how the coherence time of the inner and outer regions changes as a function of the harmonic order, the laser intensity, and the focusing conditions. Good agreement with the predictions of the semiclassical model of harmonic generation is obtained.

Received 1 June 1999

DOI:https://doi.org/10.1103/PhysRevA.60.4823

Authors & Affiliations

C. Lyngå¹, M. B. Gaarde^1,2, C. Delfin¹, M. Bellini^3,4, T. W. Hänsch^4,5,6, A. L’ Huillier¹, and C.-G. Wahlström¹

¹Department of Physics, Lund Institute of Technology, P.O. Box 118, S-221 00 Lund, Sweden
²Niels Bohr Institute, Ørsted Laboratory, Universitetsparken 5, 2100 Copenhagen, Denmark
³European Laboratory for Non Linear Spectroscopy (LENS), Largo Enrico Fermi, 2, I-50125 Florence, Italy
⁴Istituto Nazionale di Fisica della Materia (INFM), Italy
⁵Department of Physics, University of Florence, Largo Enrico Fermi, 2, I-50125 Florence, Italy
⁶Max-Planck-Institut für Quantenoptik, P.O. Box 1513, D-85740 Garching, Germany

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Vol. 60, Iss. 6 — December 1999

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