We measured in a large spectral range from 180 eV to 20 keV the x-ray emission from aluminum and glass targets irradiated by 150 fs laser pulses at intensities of ≈1017 W/cm2. Unexpected large differences are observed at photon energies above ≈1 keV, where the Al target emitted almost 100 times more x rays than glass. Important for this result is a high prepulse to main pulse contrast.
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Saemann et al. (1998) studied this question.
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