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Яковлев, Валерий Петрович

Организационные подразделения

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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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Яковлев

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Валерий Петрович

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Modification of D2-line absorption contours of alkali atoms in antirelaxation coated cells
(2019) Tsygankov, E. A.; Chuchelov, D. S.; Zibrov, S. A.; Fomichev, D. E.; Velichansky, V. L.; Yakovlev, V. P.; Величанский, Владимир Леонидович; Яковлев, Валерий Петрович
© Published under licence by IOP Publishing Ltd.Absorption features in cells with antirelaxation coating in D2 -lines of alkali metal atoms due to the competition of cyclic and open transitions lying within the Doppler contour are studied. In cells of this type ensemble of atoms is optically pumped over all velocities and the entire volume of the cell during the characteristic time T, which noticeably exceeds local pumping times related to resonant atomic velocities. If the frequency scanning T, the retardation effect results in significant distortion of the laser wave absorption contour and to emergence of the hysteresis phenomenon. The developed theory for a realistic scheme of atomic levels with one cyclic and two open transitions describes experimentally observed absorption contours, their dependence on the light power and the frequency scanning direction.
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Study of factors affecting the light shift of the CPT resonance
(2020) Chuchelov, D. S.; Tsygankov, E. A.; Vaskovskaya, M. I.; Zibrov, S. A.; Velichansky, V. L.; Yakovlev, V. P.; Величанский, Владимир Леонидович; Яковлев, Валерий Петрович
© Published under licence by IOP Publishing Ltd.Motivated by recent developments in atomic frequency standards employing the effect of coherent population trapping (CPT), we propose a theoretical framework for describing the CPT resonances. Our extended model includes several realistic experimental factors not accounted for in the standard approaches, namely, the FM-based technique for generating the error signal, skewed laser spectrum, etc. We provide a simple yet non-trivial analytical solution revealing the magnitude and structure of the light shift. The performance of the model is checked against numerical simulations, the agreement is good to perfect.
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Two-quantum magnetic resonance driven by a comb-like rf field
(2020) Tsygankov, E. A.; Zibrov, S. A.; Zibrov, A. S.; Vassiliev, V. V.; Yakovlev, V. P.; Яковлев, Валерий Петрович
© 2020 Optical Society of AmericaWe report a new method for excitation of magnetic resonance in an optically aligned atomic ensemble. It employs a comb-like rf field acting on the end sublevels of the Fg = 1 state separated by the doubled Zeeman frequency. This approach provides a resonance without substructures associated with the quadratic Zeeman shift. A theoretical explanation of the effect is given in terms of the two-quantum transition |Fg = 1, mFg = −1i |Fg = 1, mFg = 1i and is corroborated by an experiment with 87Rb atoms. Possible advantages of the approach and its range of applicability are discussed.
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Single magneto-optical resonance in a modulated RF field
(2019) Tsygankov, E. A.; Zibrov, S. A.; Zibrov, A. S.; Vaskovskaya, M. I.; Velichansky, V. L.; Yakovlev, V. P.; Величанский, Владимир Леонидович; Яковлев, Валерий Петрович
A symmetric magneto-optical resonance arising from the single two-quantum RF transition vertical bar F-g = 1, m(Fg) = -1 > reversible arrow vertical bar F-g = 1, m(Fg) = 1 > in an optically aligned atomic ensemble is studied in the case when the quadratic Zeeman shift exceeds the width of the resonance. It is shown that the signal-to-noise ratio of the resonance can be significantly increased by applying the phase modulation to the RF field at a frequency close to the value of quadratic Zeeman shift. This theoretical prediction is corroborated by the experimental results with Rb-87 atoms. The proposed technique can be used in magnetometers based on atomic alignment or by utilizing multiquantum RF resonances in optically oriented atomic ensembles.
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Autoelectronic emission and charge relaxation of thorium ions implanted into a thin-film silicon oxide matrix
(2021) Borisyuk, P. V.; Chubunova, E. V.; Kolachevsky, N. N.; Lebedinskii, Y. Y.; Tkalya, E. V.; Vasilyev, O. S.; Yakovlev, V. P.; Борисюк, Петр Викторович; Чубунова, Елена Витальевна; Лебединский, Юрий Юрьевич; Ткаля, Евгений Викторович; Васильев, Олег Станиславович; Яковлев, Валерий Петрович
An ensemble of thorium-229 ions embedded by pulsed laser implantation into a matrix of a broadband dielectric-silicon oxide is studied. The results of the experimental investigation of thorium ions' lifetime as charged components of the Th+/SiO2/Si system formed immediately after laser implantation are presented. The modelled theoretical description takes into account the instantaneous charging of the surface via laser implantation followed by charge relaxation due to the effect of autoelectronic emission that leads to time dependent partial neutralization of the surface charge by tunneling electrons. It was found that the lifetime of Th+ ions on the SiO2 surface can exceed 10 s, which would be an attractive opportunity for studying the nuclear low-lying isomeric transition in the thorium-229 isotope.
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Polarization asymmetry of the dark-resonance frequency dependence on the magnetic field
(2021) Tsygankov, E. A.; Vaskovskaya, M. I.; Chuchelov, D. S.; Zibrov, S. A.; Velichansky, V. L.; Yakovlev, V. P.; Величанский, Владимир Леонидович; Яковлев, Валерий Петрович
© 2021 Optical Society of AmericaWe demonstrate the possibility of suppressing the linear response of the coherent population trapping resonance frequency to variations in the external magnetic field. The suppression can be achieved at a specific value of the clock magnetic field B due to the competition between the frequency pulling by neighboring resonances and the quadratic Zeeman shift. The effect is possible only with certain combinations of the optical field polarization and the direction of the magnetic field. An incorrect field configuration can significantly increase the magnetic-induced frequency shifts.
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ThSi10O22 Compound as Target for Production of Isomeric Thorium-229 Nuclei at Electron Beam Irradiation
(2020) Borisyuk, P. V.; Chubunova, E. V.; Lebedinskii, Y. Y.; Vasilyev, O. S.; Yakovlev, V. P.; Борисюк, Петр Викторович; Чубунова, Елена Витальевна; Лебединский, Юрий Юрьевич; Васильев, Олег Станиславович; Яковлев, Валерий Петрович
© 2020, Pleiades Publishing, Ltd.Abstract: A method for excitation of thorium-229 isomeric nuclei the electron beam irradiation of a solid-state target based on thorium silicate is considered. The key point for obtaining an effective yield of isomeric nuclei is the generation of secondary electrons with a significant increase in the multiplication factor for electrons that have energies within a range from 1 to 25 keV. Based on numerical simulation and theoretical estimation of the excitation cross section of isomeric transition in inelastic scattering, the yield function of isomeric nuclei was o qualitatively obtained.
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Cumulative loading of the ion trap by laser ablation of thorium target in buffer gas
(2020) Khabarova, K. Yu.; Kolachevsky, N. N.; Derevyashkin, S. P.; Borisyuk, P. V.; Strelkin, S. A.; Tkalya, E. V.; Tregubov, D. O.; Tronin, I. V.; Yakovlev, V. P.; Борисюк, Петр Викторович; Ткаля, Евгений Викторович; Трегубов, Дмитрий Олегович; Тронин, Иван Владимирович; Яковлев, Валерий Петрович
© 2020 Astro Ltd Printed in the UKWe describe a method that allows accumulation in a Paul trap of a large number of ions obtained from multiple laser ablation pulses, and therefore solving the problem of a single pulse that usualy gives rise to final trapping of too few ions. The proposed method of the cumulative trap loading was based on interaction with a buffer gas that provided a friction force. The method was applied to triply charged thorium ions and trapped a total of 106 ions. Numerical analysis of the ion motion allowed the experimental parameters to be optimized for the most effective implementation of the technique.