Temporal coherence of ultrashort high-order harmonic pulses

Year: 1998

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

Autors Affiliation: European Laboratory for Non Linear Spectroscopy, Largo E. Fermi, 2, Florence, I-50125, Italy;
Istituto Nazionale di Fisica della Materia, INFM, Florence, Italy;
Department of Physics, Lund Institute of Technology, P.O. Box 118, Lund, S-221 00, Sweden

Abstract: We have studied the temporal coherence of high-order harmonics (up to the 15th order) produced by focusing 100 fs laser pulses into an argon gas jet. We measure the visibility of the interference fringes, produced when two spatially separated harmonic sources interfere in the far field, as a function of the time delay between the two sources. In general, we find long coherence times, comparable to the expected pulse durations of the harmonics. For some of the harmonics, the interference pattern exhibits two regions, with significantly different coherence times. These results are interpreted in terms of different electronic trajectories contributing to harmonic generation. © 1998 American Physical Society.

Journal/Review: PHYSICAL REVIEW LETTERS

Volume: 81 (2)      Pages from: 297  to: 300

KeyWords: Generation; Radiation; Laser
DOI: 10.1103/PhysRevLett.81.297

Citations: 332
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