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Dudelev, V V; Losev, S N; Mylnikov, V Yu; Babichev, A V; Kognovitskaya, E A; Slipchenko, S O; Lutetskii, A V; Pikhtin, N A; Kuchinskii, V I; Sokolovskii, G S; Rozhansky, I V; Novikov, I I; Egorov, A Yu; Gladyshev, A G; Karachinsky, L Ya, E-mail: v.dudelev@mail.ru2018
AbstractAbstract
[en] We present a study of the characteristics of quantum-cascade lasers with a wavelength around 8 μm in a wide temperature range up to 338 K (+650C). Spectral studies reveal lasing in two bands around ∼ 7800 nm and ∼ 8100 nm. The observed competition between short and long wavelength lasing lines leads to non-monotonic behaviour of the radiation intensity in relation to the pumping current. (paper)
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International Conference PhysicA.SPb/2018; Saint Petersburg (Russian Federation); 23-25 Oct 2018; Available from http://dx.doi.org/10.1088/1742-6596/1135/1/012073; Country of input: International Atomic Energy Agency (IAEA)
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Journal Article
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Conference
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Journal of Physics. Conference Series (Online); ISSN 1742-6596;
; v. 1135(1); [6 p.]

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Wang, Jing; Chan, K. S.; Lin, Zijing, E-mail: apkschan@cityu.edu.hk, E-mail: zjlin@ustc.edu.cn, E-mail: apkschan@cityu.edu.hk, E-mail: zjlin@ustc.edu.cn2014
AbstractAbstract
[en] We studied the generation of valley dependent current by adiabatic quantum pumping in monolayer graphene in the presence of electric potential barriers, ferromagnetic field and strain. The pumped currents in the two valleys have same magnitudes and opposite directions; thus, a pure valley current is generated. The oscillation of the pumped pure valley current is determined by the Fabry-Perot resonances formed in the structure. In our calculation, the pumped pure valley current can be as high as 50 nA, which is measurable using present technologies. The proposed device is useful for the development of graphene valleytronic devices
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(c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
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AbstractAbstract
[en] Long pulse (200 ns) XeCl excimer laser emission (lambda = 3,080 A), has been obtained when Ne/Xe/HCl mixtures are excited by an electron beam and X ray assisted discharge either at room temperature or at very low temperature. Absorbed discharge energy is several orders of magnitude higher than the absorbed beam energy. Maximum specific laser energy is 3 J/l at room temperature for a 16 cm gain length and an absorbed discharge energy of 150 J/l
[fr]
Une emission laser de longue duree (200 ns) et de rendement eleve a ete obtenue a 3080 A a partir de l'excimere XeCl* a la suite de l'excitation de melanges Ne/Xe/HCl a temperature ambiante et a tres basse temperature par une decharge en regime d'avalanche assistee par un faisceau d'electrons et de rayons X. L'energie apportee au milieu actif par la decharge etait de plusieurs ordres de grandeur superieure a celle apportee par le faisceau de preionisation. L'energie specifique laser maximale obtenue etait de 3 J/l a temperature ambiante pour une longueur de gain de 16 cm et une energie apportee au milieu actif par la decharge egale a 150 J /lOriginal Title
Laser XeCl a decharge assistee par un faisceau d'electrons et de rayons X
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Journal Article
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Comptes Rendus des Seances de l'Academie des Sciences. Serie 2; v. 292(10); p. 765-770
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Artyunyan, V.M.; Adonts, G.H.; Akopyan, D.G.; Arutyunyan, K.V
Izvestia Natsional'noj Akademii Nauk Armenii, Yerevan (Armenia)1988
Izvestia Natsional'noj Akademii Nauk Armenii, Yerevan (Armenia)1988
AbstractAbstract
[en] The problem of interaction of radiation having arbitrary polarization and intensity with 1/2-1/2 and 1-0 resonant systems was solved. Exact expressions for the vectors of orientation of lower and upper states of the 1/2-1/2 system and for the vector of orientation and tensor of alignment of the 1-0 system in the field of elliptically polarized radiation are obtained. The influence of disorientating atomic collisions on the process of optical pumping was also studied. 10 refs
Original Title
Opticheskaya orientatsiya i vystraivanie atomnykh sistem 1/2-1/2 i 1-0 v pole nasyshchayushchej ehllipticheski polyarizovannoj volny
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Journal Article
Journal
Izvestiya National'noj Akademii Nauk Armenii. Fizika; ISSN 1025-5613;
; CODEN IAAFF8; v. 23(6); p. 333-338

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AbstractAbstract
No abstract available
Original Title
Cresyl violet perchlorate in methanol solution
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Journal Article
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IEEE (Inst. Electr. Electron. Eng.) J. Quant. Electron; v. QE-11(2); p. 70-74
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AbstractAbstract
No abstract available
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Published in summary form only.
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Journal Article
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Applied Optics; v. 13(11); p. 2457-2458
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Davidovich, L.; Guerra, E.S.; Zagury, N.; Zelaquett, A.
Proceedings of the 13. National Meeting on Condensed Matter Physics1990
Proceedings of the 13. National Meeting on Condensed Matter Physics1990
AbstractAbstract
[en] Published in summary form only
Original Title
Efeitos de estatistica de bombeamento em micromasers
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Source
Almeida Fonseca, A.L. de (Brasilia Univ., DF (Brazil)); Koiler, B. (Pontificia Univ. Catolica do Rio de Janeiro, RJ (Brazil)); Brescansin, L.M. (Universidade Estadual de Campinas, SP (Brazil)) (and others); Sociedade Brasileira de Fisica, Rio de Janeiro, RJ (Brazil); 284 p; 1990; p. 164; 13. National Meeting on Condensed Matter Physics; Caxambu, MG (Brazil); 8-12 May 1990; Available from the Library of Comissao Nacional de Energia Nuclear, RJ, Brazil
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Miscellaneous
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Conference
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AbstractAbstract
No abstract available
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Israel Physical Society, Jerusalem; Bulletin of the Israel Physical Society; v. 23; p. 23-24; 1977; p. 23-24; Israel Physical Society 1977 annual meeting; Ramat Gan, Israel; 27 - 28 Mar 1977; Published in summary form only.
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Hartemink, Menno.
Technische Univ. Twente, Enschede (Netherlands)1991
Technische Univ. Twente, Enschede (Netherlands)1991
AbstractAbstract
[en] The absorption analysis is introduced with an experimental set-up of the CO2 pump laser and the CF4 laser. Special attention is paid to the frequency stabilization scheme of CO2 laser and the description system. Attention is also focused on the continuous wave output of the CF4 laser. The directional dependence of the gain, and thus of the emitted power is described. It was found that more radiation is emitted in the direction co-propagating than counter-propagating with the pump laser, known as 'gain anisotropy'. This work performs a quantitative study of pump threshold 'gain anisotropy' confirming theoretical predictions, by a study of pump threshold powers. An experimental study of the output of the continuous wave CF4 laser as a function of pressure and temperature is given. The frequency of the pump laser was stabilized using an opto-acoustic cell. Experiments with a resonance enhanced low pressure opto-acoustic cell is introduced. The experimental results were compared with the predictions of a model, which incorporates a description of the cell geometry and the properties of the active gas in the cell. Corrections were made to describe the low pressure behaviour of the cell. (A.S.). 113 refs.; 42 figs.; 12 tabs
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10 Oct 1991; 143 p; ISBN 90-9004442-6;
; Photo-copies available from Library KNAW; P.O. Box 41950, 1009 DD Amsterdam, The Netherlands (MON 38248); This work was supported by Ultra-Centrifuge Nederland N.V. (UCN) and the Nederlands Centrum voor Laser Research B.V. (NCLR); includes summary in Dutch and list of publications by the author.; Proefschrift (Dr.).

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Thesis/Dissertation
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AbstractAbstract
[en] The internal structure of a particle an atom or other quantum system in which the excitation energies are discrete undergoes change when exposed to pulses of near-resonant laser light. This tutorial review presents basic concepts of quantum states, of laser radiation and of the Hilbert-space state vector that provides the theoretical portrait of probability amplitudes the tools for quantifying quantum properties not only of individual atoms and molecules but also of artificial atoms and other quantum systems. It discusses the equations of motion that describe the laser-induced changes (coherent excitation), and gives examples of laser=pulse effects, with particular emphasis on two-state and three-state adiabatic time evolution within the rotating-wave approximation. It provides pictorial descriptions of excitation based on the Bloch equations that allow visualization of two-state excitation as motion of a three-dimensional vector (the Bloch vector). Other visualization techniques allow portrayal of more elaborate systems, particularly the Hilbert-space motion of adiabatic states subject to various pulse sequences. Various more general multilevel systems receive treatment that includes degeneracies, chains and loop linkages. The concluding sections discuss techniques for creating arbitrary pre-assigned quantum states, for manipulating them into alternative coherent superpositions and for analyzing an unknown superposition. Appendices review some basic mathematical concepts and provide further details of the theoretical formalism, including photons, pulse propagation, statistical averages, analytic solutions to the equations of motion, exact solutions of periodic Hamiltonians, and population-trapping 'dark' states. (author)
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177 refs.
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Journal Article
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Acta Physica Slovaca; ISSN 0323-0465;
; v. 58(3); p. 243-486

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