Abstract
Conventionally, attosecond pulses are obtained using generation of high-order optical harmonics upon excitation of various media by femtosecond laser pulses with the central frequency in the infrared range. Here, we consider theoretically an alternative possibility of obtaining an isolated extreme ultraviolet (XUV) attosecond pulse in a thin layer of helium atoms excited by a pair of half-cycle (quasi-unipolar) X-ray pulses. The approach is based on the free polarization decay of an atomic medium. An analogy of the processes under consideration with the phenomenon of superradiance is discussed.
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Funding
Investigations by R.M. Arkhipov and N.N. Rosanov were financially supported by the Russian Foundation for Basic Research, project nos. 20-32-70049 (theory of attosecond pulse generation and numerical simulations) and 19-02-00312 (sections devoted to the simplified classical theory for the generation of an attosecond pulse and the connection with superradiance). I. Babushkin acknowledges support from the PhoenixD innovation cluster (EXC 2122, project no. 390833453) and Deutsche Forschungsgemeinschaft, project no. BA4156/4-2.
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Arkhipov, R.M., Arkhipov, M.V., Babushkin, I. et al. Generation of an Attosecond Pulse in Helium Excited by Half-Cycle X-Ray Pulses. Opt. Spectrosc. 128, 529–535 (2020). https://doi.org/10.1134/S0030400X20040025
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DOI: https://doi.org/10.1134/S0030400X20040025