Spatial separation of large dynamical blueshift and harmonic generation

Mette B. Gaarde, Mitsuko Murakami, and Reinhard Kienberger
Phys. Rev. A 74, 053401 – Published 2 November 2006

Abstract

We study the temporal and spatial dynamics of the large amplitude and frequency modulation that can be induced in an intense, few cycle laser pulse as it propagates through a rapidly ionizing gas. Our calculations include both single atom and macroscopic interactions between the nonlinear medium and the laser field. We analyze the harmonic generation by such pulses and show that it is spatially separated from the ionization dynamics which produce a large dynamical blueshift of the laser pulse. This means that small changes in the initial laser focusing conditions can lead to large differences in the laser frequency modulation, even though the generated harmonic spectrum remains essentially unchanged. We also show that the ionization dynamics strongly influences the possibility of synthesizing isolated attosecond pulses.

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  • Received 26 April 2006

DOI:https://doi.org/10.1103/PhysRevA.74.053401

©2006 American Physical Society

Authors & Affiliations

Mette B. Gaarde* and Mitsuko Murakami

  • Department of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana 70803-4001, USA

Reinhard Kienberger

  • Max Planck Institute for Quantum Optics, Garching, D-85748 Germany

  • *Electronic address: gaarde@phys.lsu.edu

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Issue

Vol. 74, Iss. 5 — November 2006

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