Showing papers by "Andrey Popov published in 2005"
TL;DR: In this paper, specific features of nonlinear interference processes at quantum transitions in near and fully resonant Doppler-broadened optically dense media are studied, and the possibility of all-optical switching of the medium to opaque or, alternatively, to absolutely transparent, or even to strongly amplifying states is explored, controlled by a small variation of two driving or probe radiations and does not require any change of the level populations.
Abstract: Specific features of nonlinear interference processes at quantum transitions in near- and fully resonant Doppler-broadened optically dense media are studied. The possibility of all-optical switching of the medium to opaque or, alternatively, to absolutely transparent, or even to strongly amplifying states is explored, which is controlled by a small variation of two driving or probe radiations and does not require any change of the level populations. Optimum conditions for inversionless amplification of short-wavelength radiation above the oscillation threshold at the expense of the longer-wavelength control fields are investigated. The feasibility of overcoming the fundamental limitation on a velocity-interval of resonantly coupled molecules imposed by the Doppler effect is shown, based on quantum coherence.
27 citations
TL;DR: In this article, the output parameters of a Tm3+:YAlO3 laser pumped by laser diodes in the spectral region 802?810 nm were studied and the output cw power exceeded 10 W for the total efficiency above 30%.
Abstract: The output parameters of a Tm3+:YAlO3 laser pumped by laser diodes in the spectral region 802?810 nm are studied. The output cw power exceeded 10 W for the total efficiency above 30%. The laser wavelength varies in the range from 1946 to 1985 nm and is determined by the pump power and resonator losses in this spectral region. The efficiency of cross relaxation process during the population of the 3F4 laser level is measured.
16 citations
TL;DR: In this article, a laser-stimulated synthesis of large silver nanoaggregates consisting of hundreds to thousands of nanoparticles is investigated, where the morphology of the synthesized nanostructures can be controlled with light and monitored via the evolution of the colloid absorption spectra.
Abstract: A Laser-stimulated synthesis of large silver nanoaggregates consisting of hundreds to thousands of nanoparticles is investigated. It is shown that the morphology of the synthesized nanostructures can be controlled with light and monitored via the evolution of the colloid absorption spectra. A solution method is demonstrated that enables production of a bulk amount of metal nanoaggregates, which are of paramount importance for subwavelength concentration and dramatic enhancement of the electromagnetically-induced processes at the nanoscale.
13 citations
01 Jan 2005
TL;DR: Bencardino et al. as mentioned in this paper presented an analysis of Bencardino's work in the field of geophysics with the aim of identifying the most important features of the current state of the art.
Abstract: R. Bencardino, F. Altamura, V. Bidoli, L. Bongiorno, M. Casolino, M.P. De Pascale, M. Ricci, P. Picozza, D. Aisa, A. Alvino, S. Ascani, P. Azzarello, R. Battiston, S. Bizzaglia, M. Bizzarri, S. Blasko, L. Di Masso, G. Chiocci, D. Cosson, G. Esposito, S. Lucidi, A. Papi, V. Postolache, S. Rossi, G. Scolieri, M. Ionica, A. Franceschi, S. Dell'Agnello, C. Falcone, S. Tassa, A.Kalmikov, A.V.Popov, A. Abramov, M.C. Korotkov, A.M. Galper, A. Ivanova, L. Conti, V. Sgrigna, C. Stagni, A. Buzzi, D. Zilpimiani, A. Pontetti and L. Valentini (a) Physics Department of "Tor Vergata University" and Roma II Section of INFN, Via della Ricerca Scientifica 1, 00133 Roma, Italy (b) Physics Department and INFN Section of Perugia, Via Pascoli, 06100 Perugia, Italy (c) INFN, Laboratori Nazionali di Frascati, Via E. Fermi 40, 00044 Frascati, Italy (d) Nergal S.r.l. Via Baldanzellu 8, 00155 Roma, Italy (e) Moscow Engineering and Physics Institute, Kashirskoe Shosse 31, RU-115409 Moscow, Russia (f) Physics Department of "Roma III University" Via della vasca navale 84, 00146 Roma, Italy (g) Institute of geophysics, Georgian Academy of Science (GAS) and National Space agency of Tbilisi, republic of Georgia (h) Ferrari BSN, Località Miole 100, 67063 Oricola (AQ), Italy Presenter: R. Bencardino (Raffaele.Bencardino@roma2.infn.it), ita-bencardino-R-abs1-sh36-poster
6 citations
TL;DR: Switching from opaque via transparent to a strongly amplifying state is shown to be possible for molecular media without a change in the noninverted population of their energy levels.
Abstract: Switching from opaque via transparent to a strongly amplifying state is shown to be possible for molecular media without a change in the noninverted population of their energy levels.
5 citations
TL;DR: In this article, it is shown that switching anisotropic molecules from strongly absorbing to strongly amplifying through a transparent state is possible by the application of dc or ac control electric fields without the requirement of population inversion.
Abstract: Switching anisotropic molecules from strongly absorbing to strongly amplifying through a transparent state is shown to be possible by the application of dc or ac control electric fields without the requirement of population inversion. It is based on decoupling of the lower level molecules from the resonant light while the excited ones remain emitting due to their state-dependent alignment. The amplification index may become dependent only on a number of excited molecules and not on the population of the lower state. A suitable class of molecules and applications in optoelectronics, fibreoptics and nanophotonics are outlined.
3 citations
01 Jan 2005
TL;DR: Casolino et al. as discussed by the authors presented an analysis of the performance of the current state-of-the-art systems in terms of their ability to solve the problem of space flight.
Abstract: F. Altamura, R. Bencardino, V. Bidoli, M. Casolino, M.P. De Pascale, M. Minori, P. Picozza, A. Alvino, S. Ascani, P. Azzarello, R. Battiston, S. Bizzaglia, M. Bizzarri, S. Blasko, G. Chiocci, D. Cosson, L. Di Masso, G. Esposito, L. M. Farnesini, M. Ionica, S. Lucidi, A. Papi, V. Postolache, S. Rossi, G. Scolieri, L. Bongiorno, S. Dell’Agnello, A. Franceschi, M. Ricci, C. Falcone, S. Tassa, A. Abramov, A.M. Galper, A. Ivanova, A. Kalmikov, M.C. Korotkov, A.V. Popov, A. Buzzi , L. Conti , V. Sgrigna , C. Stagni , D. Zilpimiani, A. Pontetti, L. Valentini M.Durante, V.Guarnieri , C.Lobascio , V.Roca, E. Tracino, R. Vittori (a) Physics Department of ”Tor Vergata University” and Roma II Section of INFN, Via della Ricerca Scientifica 1, 00133 Roma, Italy (b) Physics Department and INFN Section of Perugia, Via Pascoli, 06100 Perugia, Italy (c) INFN, Laboratori Nazionali di Frascati, Via E. Fermi 40, I-00044 Frascati, Italy (d) Nergal S.r.l. Via Baldanzellu 8, 00155 Roma, Italy (e) Moscow Engineering and Physics Institute, Kashirskoe Shosse 31, RU-115409 Moscow, Russia (f) Physics Department of ”Roma III University” Via della vasca navale 84, 00146 Roma, Italy (g) Institute of geophysics, Georgian Accademy of Science (GAS) and National Space agency of Tbilisi, Republic of Georgia (h) Ferrari BSN, Localit Miole 100, 67063 Oricola (AQ), Italy (i) University of Naples ”Federico II” (j) Aleniaspazio, Strada Antica di Collegno, 10146 Torino (Italy) (k) University of Piemonte Orientale, Via Bellini 25/G, 15100 Alessandria, Italy (l) ESA, European Astronaut Centre, Cologne Presenter: M. Casolino (casolino@roma2.infn.it), ita-casolino-M-abs2-sh35-poster
2 citations
13 Apr 2005
TL;DR: In this paper, the possibilities for control over the size and properties of silver nanoaggregates with incoherent and laser light are investigated, and the applications in nanoengineering and for giant enhancement of optical processes at nanoscale are discussed.
Abstract: The possibilities for control over the size and properties of silver nanoaggregates with incoherent and laser light are investigated. The applications in nanoengineering and for giant enhancement of optical processes at nanoscale are discussed.
1 citations
TL;DR: In this paper, anisotropic molecules are switched from strongly absorbing to strongly amplifying through a transparent state by application of dc or ac control electric fields without the requirement of the population inversion, and the amplification index may become dependent only on a number of excited molecules and not on the population of the lower state.
Abstract: Switching anisotropic molecules from strongly-absorbing to strongly-amplifying through a transparent state is shown to be possible by application of dc or ac control electric fields without the requirement of the population inversion. It is based on decoupling of the lower-level molecules from the resonant light while the excited ones remain emitting due to their state-dependent alignment. The amplification index may become dependent only on a number of excited molecules and not on the population of the lower state. A suitable class of molecules and applications in optoelectronics, fiberoptics and nanophotonics are outlined.