Temporal coherence of high-order harmonics

Year: 1999

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

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

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.

Journal/Review: PHYSICAL REVIEW A

Volume: 60 (6)      Pages from: 4823  to: 4830

DOI: 10.1103/PhysRevA.60.4823

Citations: 66
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