Abstract
The interaction of 100-fs Ti:sapphire laser pulses with thin foil targets was experimentally investigated at intensities exceeding . High harmonics were observed in transmission through an overdense plasma in the direction of the incident beam. From the cutoff frequency of the harmonics an electron density of is inferred, indicating a compression of the plasma by the ponderomotive force of the laser pulse.
© 1997 Optical Society of America
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