Abstract
We have demonstrated that the efficiency of hard X-ray generation (with energy 2 − 4 keV) from the femtosecond laser excitation (intensity I ∼ 1016 W/cm2, pulse energy E ∼ 5 mJ) of large molecular clusters (SF6, CF3I) can reach ∼ 10−6 (with yield ∼ 109 photons/J). It was shown that at maximal X-ray yield, the plasma filament is essentially non-uniform and has a multifocal structure. It was observed that the amplitude of the central and trailing spectral components of the chirped laser pulse decreases after its interaction with the cluster target as a result of efficient laser energy absorption under self-focusing conditions.
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Gordienko, V.M., Dzhidzhoev, M.S., Zhvaniya, I.A. et al. Hard X-ray generation and plasma filament formation under interaction of femtosecond laser pulses with large molecular clusters. Eur. Phys. J. D 67, 55 (2013). https://doi.org/10.1140/epjd/e2013-30497-7
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DOI: https://doi.org/10.1140/epjd/e2013-30497-7