Abstract
The spontaneous emission of an atomic system in the field of a high-intensity femtosecond laser pulse is considered within the framework of a consistent quantum-mechanical approach based on an examination of the interaction of a quantum system with a set of quantized field modes in a vacuum state. Both even and odd harmonics of the driving field are shown to appear in the atomic emission spectrum, and the mechanisms of their generation are elucidated. A comparison with the semiclassical theory of laser harmonic generation is made. The semiclassical approach in describing the spontaneous emission in strong laser fields, especially under conditions of significant depletion of the ground (initial) state in a laser field, is shown to be limited.
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Original Russian Text © A.V. Bogatskaya, E.A. Volkova, A.M. Popov, 2017, published in Zhurnal Eksperimental’noi i Teoreticheskoi Fiziki, 2017, Vol. 152, No. 4, pp. 694–704.
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Bogatskaya, A.V., Volkova, E.A. & Popov, A.M. Spontaneous emission of atoms in a strong laser field. J. Exp. Theor. Phys. 125, 587–596 (2017). https://doi.org/10.1134/S1063776117090114
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DOI: https://doi.org/10.1134/S1063776117090114