Abstract

Dynamics of muliphoton ionization in the tunneling (long wavelength, high intensity) regime is described. Photoemission by tunnel ionized atoms is dominated by the odd harmonics of the driving laser field. Excitation by ultra short ({similar_to} 10-20 fs) pulses produces hiogh harmonics with characteristics which will alow them to be compressed to given coherent sources of VUV and possibly XUV radiation with pulse lengths near or below 1 fs.

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