Персона: Урюпин, Сергей Александрович
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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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- ПубликацияТолько метаданныеMotion of a Chain of Vortices Under Different Conditions of Passing a Current Through a Josephson Junction Coupled to a Waveguide(2019) Malishevskii, A. S.; Silin, V. P.; Uryupin, S. A.; Урюпин, Сергей Александрович© 2019, Springer Science+Business Media, LLC, part of Springer Nature.We obtain the current–voltage characteristics for the following three modes of current passing through a system consisting of a Josephson junction coupled to a waveguide: first, only through the waveguide; second, both through the junction and through the waveguide; and third, only through the junction. In the first and second modes, sustaining of the induced motion of fast vortex chains is possible at a lower current density than that in the third mode.
- ПубликацияТолько метаданныеWaves in plasma formed by above-threshold ionization of gas atoms(2019) Vagin, K. Y.; Mamontova, T. V.; Uryupin, S. A.; Мамонтова, Татьяна Вячеславовна; Урюпин, Сергей Александрович© 2019In the regime of above-threshold ionization of gas atom in the field of laser radiation, plasma with photoelectron distribution consisting of peaks at discrete energy values is formed. It is shown that the number of longitudinal waves in such plasma coincides with the number of peaks in the distribution function. When peaks practically don't overlap, the dispersion law of each wave in the region of short waves is determined by electrons from the corresponding peak. In this case the phase and group velocities of the waves are close to the electron velocity, which corresponds to the peak maximum. It is possible to talk about such waves as an electronic sound, since the perturbations of the electron density mainly arise due to pressure perturbations. When the peaks are narrow, but having a finite width, the Cherenkov damping of waves is exponentially small. Numerical calculations the dispersion laws for of the two and four waves in photoionized xenon plasma, in which the electron distribution function consists of two or four narrow peaks are given.
- ПубликацияТолько метаданныеPlasmon-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.
- ПубликацияТолько метаданныеDependence 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.
- ПубликацияТолько метаданныеGeneration of terahertz radiation in the interaction of a femtosecond pulse with a metal film(2019) Danilov, E. A.; Uryupin, S. A.; Урюпин, Сергей АлександровичThe action of an s-polarised femtosecond laser pulse is found to result in nonlinear currents in a metal film, which arise due to the nonuniform heating of the conduction electrons and under the influence of the drag force. The Fourier transforms of a low-frequency magnetic field generated by nonlinear currents are calculated. It is shown that when the film thickness is less than the scale of the low-frequency field nonuniformity, the amplitude of the tera-hertz signal increases in inverse proportion to the film thickness. If the thickness of the film is less than the depth of the skin layer at the laser frequency, the low-frequency signal is amplified inversely proportional to the square of the film thickness.