Abstract
Solid surface harmonics, a potential source for attosecond pulses, is investigated in the extreme ultraviolet spectral range. 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. From systematic investigations with visible harmonics, we find that the preplasma scale length that is produced on the target surface has a large effect on solid surface harmonic generation.
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