Abstract
High-harmonic generation sources allow producing trains of attosecond X-ray pulses in a water window range with a relatively small number of photons. We suggest a mechanism to amplify these trains of pulses in an inverted plasma of quasi-resonant ions driven by a moderately strong infrared (IR) laser field. The IR field modulates active medium with a double IR field frequency allowing for amplification of the X-ray field not only on the resonant transition frequency but also on sideband frequencies separated from the resonance by even number of modulation frequency. In the case of relatively strong plasma dispersion, each spectral component is amplified nearly independently. This allows amplifying X-ray radiation preserving it in the form of a train of attosecond pulses. We propose an experimental realization of the suggested technique in the active medium of C VI ions modulated by the IR laser field.
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Acknowledgements
This work was supported by the NSF grant No. PHY-1596467; the King Abdulaziz City for Science and Technology (KACST) program, Robert A. Welch Foundation grant No. A-1261, as well as by RFBR under the grant No. 18-02-00924. The studies presented in Sect. 7.2 were supported by the Ministry of Education and Science of the Russian Federation under contract No.14.W03.31.0032. V. A. A. acknowledges a personal grant from Foundation for the Advancement of Theoretical Physics and Mathematics “BASIS”.
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Akhmedzhanov, T. et al. (2020). Shaping of X-ray Pulses via Dynamical Control of Their Interaction with a Resonant Medium. In: Kozlová, M., Nejdl, J. (eds) X-Ray Lasers 2018. ICXRL 2018. Springer Proceedings in Physics, vol 241. Springer, Cham. https://doi.org/10.1007/978-3-030-35453-4_7
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DOI: https://doi.org/10.1007/978-3-030-35453-4_7
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