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Phys Rev Lett. 2008 Mar 7;100(9):095004. Epub 2008 Mar 6.

Phase properties of laser high-order harmonics generated on plasma mirrors.

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  • 1Service des Photons, Atomes et Molécules, Commissariat à l'Energie Atomique, DSM/IRAMIS, CEN Saclay, 91191 Gif sur Yvette, France.


As a high-intensity laser-pulse reflects on a plasma mirror, high-order harmonics of the incident frequency can be generated in the reflected beam. We present a numerical study of the phase properties of these individual harmonics, and demonstrate experimentally that they can be coherently controlled through the phase of the driving laser field. The harmonic intrinsic phase, resulting from the generation process, is directly related to the coherent sub-laser-cycle dynamics of plasma electrons, and thus constitutes a new experimental probe of these dynamics.

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