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Phys Rev Lett. 2007 Jan 26;98(4):043903. Epub 2007 Jan 24.

Unified microscopic-macroscopic formulation of high-order difference-frequency mixing in plasmas.

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1
JILA, University of Colorado, National Institute of Standards and Technology, Boulder, Colorado 80309, USA. oren.cohen@colorado.edu

Abstract

We investigate high-order difference-frequency mixing in plasmas, taking into account the microscopic rescattering physics and propagation effects for the first time. We show that phase matching can occur over a broad frequency range, up to very high photon energies, and that it is confined to specific temporal and spatial windows. This gated phase matching mechanism is driven by the continuous phase slip between two driving fields and can be employed for manipulating the temporal, spatial, and spectral properties of high harmonic emission.

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