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Бежанов, Станислав Георгиевич

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Институт лазерных и плазменных технологий
Стратегическая цель Института ЛаПлаз – стать ведущей научной школой и ядром развития инноваций по лазерным, плазменным, радиационным и ускорительным технологиям, с уникальными образовательными программами, востребованными на российском и мировом рынке образовательных услуг.
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Бежанов
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Станислав Георгиевич
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20192
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  • Уменьшенное изображение
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    Dependence of the Two-Photon Absorption Coefficient of Steel on the Pulse Duration During Its Ablation by Femto- and Picosecond Laser Pulses
    (2019) Smirnov, N. A.; Gakovic, B.; Milovanovic, D.; Ionin, A. A.; Kudryashov, S. I.; Bezhanov, S. G.; Uryupin, S. A.; Бежанов, Станислав Георгиевич; Урюпин, Сергей Александрович
    © 2019, Pleiades Publishing, Inc.The dependences of the depth of single-pulse ablation of the steel surface on the energy density of ultrashort laser pulses (0.3–12 ps) with a wavelength of 515 nm have the form different from the usual logarithmic one for linear absorption of radiation. Since the density of states of free conduction electrons in the s band is low, and the d band of strongly bound electrons with a high density of states is located around the Fermi level, these dependences have been approximated within the two-photon absorption model. The two-photon absorption coefficient increases almost linearly with the duration of laser pulses, which indicates the saturation of absorption and allows estimating the corresponding parameters of the electronic subsystem.
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    Plasmon-Enhanced Two-Photon Absorption of Infrared Femtosecond Laser Pulses in Thin Gold Films
    (2019) Danilov, P. A.; Rudenko, A. A.; Ionin, A. A.; Umanskaya, S. F.; Kudryashov, S. I.; Bezhanov, S. G.; Uryupin, S. A.; Бежанов, Станислав Георгиевич; Урюпин, Сергей Александрович
    © 2019, Pleiades Publishing, Inc.The transmission of femtosecond laser pulses of the near-infrared range (wavelength of 1030 nm) through nanocrystalline gold films with a variable thickness (15–90 nm) has been experimentally studied for various intensities of laser radiation in the range of 1–10 TW/cm2. A dip in the transmission coefficient at the wave-length of pump pulses at moderate radiation intensities is due to two-photon transitions from d bands with a high density of states to s and p bands with a low density of states and their saturation at higher intensities. The cross section is estimated for two-photon absorption in gold films enhanced by plasmon resonance of gold nanocrystallites at the wavelength of the second harmonic of exciting radiation, which is compared to values for gold films and various plasmon nanostructures known for other spectral ranges.