Abstract
The transmission of near infrared femtosecond laser pulses (wavelength of 800 nm) and supercontinuum radiation (300–750 nm) generated by them through a 50-nm gold film immersed in water has been experimentally studied at the power of focused laser radiation in the range of 1–10 GW. An increase in the excitation intensity is accompanied by the blueshift of the edge of the extinction band of the film, which is attributed to the filling of electronic states of the s band with a low density of states caused by two-photon interband transitions from d bands with a high density of states.
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This work was supported by the Ministry of Science and Higher Education of the Russian Federation (project no. 074-U01 for the ITMO University) and by the Russian Foundation for Basic Research (project no. 17-02-00648).
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Russian Text © The Author(s), 2019, published in Pis’ma v Zhurnal Eksperimental’noi i Teoreticheskoi Fiziki, 2019, Vol. 110, No. 4, pp. 230–234.
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Kudryashov, S.I., Samokhvalov, A.A., Shelygina, S.N. et al. Ultrafast Broadband Diagnostics of the Filling of the s Band at the Two-Photon Femtosecond Laser Excitation of a Gold Film. Jetp Lett. 110, 250–253 (2019). https://doi.org/10.1134/S0021364019160069
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DOI: https://doi.org/10.1134/S0021364019160069