Abstract

The interaction of 100-fs Ti:sapphire laser pulses with thin foil targets was experimentally investigated at intensities exceeding ${10}^{18} \mathrm{W}/{\mathrm{cm}}^2$. 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 $1\times {10}^{24} {\mathrm{cm}}^{-3}$ 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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