Abstract
Solid surface harmonics, which is a potential source for attosecond pulses, is investigated in the extreme ultraviolet spectral range using a high-intensity Ti:sapphire laser system. High-order harmonics up to the 16-th order are observed using silicon wafer targets. A significant difference is observed in the harmonic intensity for different target material. This effect is further investigated through observation of second harmonics from the surface plasma. Results indicate the strong effects of preplasma scale length that is produced on the target surface.
© 2004 Optical Society of America
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