Phys. Rev. Lett. 98, 043903 (2007) [4 pages]Unified Microscopic-Macroscopic Formulation of High-Order Difference-Frequency Mixing in PlasmasReceived 17 October 2006; published 24 January 2007 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. © 2007 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.98.043903
DOI:
10.1103/PhysRevLett.98.043903
PACS:
42.65.Ky, 52.35.Mw
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