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X-ray pulse emission of alkali metal halide salts irradiated by femtosecond laser pulses

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Abstract

The alkali metal halide salts (KBr, NaBr, KI, NaI and CsI) were used to generate X-rays by femtosecond laser irradiation. Due to a wide band-gap, these materials are transparent and allow generation of X-rays inside the target rather than on its surface. The femtosecond amplified laser system “Pharos” with the wavelength \(\lambda \) = 1028 nm, 4 kHz repetition rate and typical pulse energy 250 µJ (maximum 1.5 mJ) was used for the experiment. Using this system, we were able to reach laser peak power density of \(2.7\times 10^{15}\) W/cm\(^2\). We have registered X-ray radiation spectra in a range of 3–30 keV with typical flux values of \(1\times 10^7\) ph/s for potassium \(K_\alpha \) line. We were able to confirm that there were enough electrons with the energy higher than 33 keV.

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Acknowledgements

This research was partially funded by the by European Social Fund under the No 09.3.3-LMT-K-712 “Development of Competences of Scientists, other Researchers and Students through Practical Research Activities” measure.

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Correspondence to Anton Koroliov.

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Koroliov, A., Reklaitis, J., Varsockaja, K. et al. X-ray pulse emission of alkali metal halide salts irradiated by femtosecond laser pulses. Appl. Phys. B 126, 144 (2020). https://doi.org/10.1007/s00340-020-07494-5

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