Abstract
In this study, we present the development and characterization of Cu plasma X-ray source driven by 20 W average power high repetition rate femtosecond laser in ambient atmosphere environment. The peak Cu-Kα photon flux of 2.3 × 109 photons/s into full solid angle is demonstrated (with a process conversion efficiency of ~ 10−7), using pulses with peak intensity of 4.65 × 1014 W/cm2. Such Cu-Kα flux is significantly larger than others found in comparable experiments, performed in air environment. The effects of resonance plasma absorption process, when optimized, are shown to increase measured flux by the factor of 2–3. The relationship between X-ray photon flux and plasma-driving pulse repetition rate is quasi-linear, suggesting that fluxes could further be increased to 1010 photons/s using even higher average powers of driving radiation. These results suggest that to fully utilize the potential of high repetition rate laser sources, novel target material delivery systems (for example, jet-based ones) are required. On the other hand, this study demonstrates that high energy lasers currently used for plasma X-ray sources can be conveniently and efficiently replaced by high average power and repetition rate laser radiation, as a way to increase the brightness of the generated X-rays.
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Baguckis, A., Plukis, A., Reklaitis, J. et al. Generation of plasma X-ray sources via high repetition rate femtosecond laser pulses. Appl. Phys. B 123, 290 (2017). https://doi.org/10.1007/s00340-017-6868-7
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DOI: https://doi.org/10.1007/s00340-017-6868-7