Abstract
Hard X-ray radiation is generated at 1-kHz repetition rate on metal targets using 30-fs sub-millijoule laser pulses. Spinning-disc targets of medium-Z (Ti, Cr, Fe, Ni, Cu, Zn and Mo) and high-Z (Ta) metals are investigated. For medium-Z targets, characteristic K-shell emission (K α and K β) is observed in the 4–20 keV energy range in addition to a broadband bremsstrahlung background. Whereas in former studies similar results have been obtained by applying laser pulses in the tens-to-hundreds-of-millijoules range, we observe characteristic X-ray generation even at applied pulse energies as low as 100 μJ. The well-defined emission wavelength, the high intensity and the high brightness of this radiation makes this source a promising tool for time-resolved experiments with high-repetition-rate (≥10 kHz) small-scale table-top laser systems .
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42.65.-k; 52.38.Ph; 52.50.Jm
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Hagedorn, M., Kutzner, J., Tsilimis, G. et al. High-repetition-rate hard X-ray generation with sub-millijoule femtosecond laser pulses. Appl. Phys. B 77, 49–57 (2003). https://doi.org/10.1007/s00340-003-1226-3
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DOI: https://doi.org/10.1007/s00340-003-1226-3