Abstract
We report the observation of harmonics up to 119th in helium, generated using a 1.053μm. 1ps CPA laser at intensities up to 3×1014 W/cm2 and have measured their spatial distribution. Complex spatial distributions are found for harmonics in the plateau region and near the cut-off, their angular distribution narrows to values similar to that predicted by lowest order perturbation theory.
© 1993 Optical Society of America
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