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Saint Petersburg, Russia

Rosanov N.N.,S. I. Vavilov State Optical Institute
Physical Review A - Atomic, Molecular, and Optical Physics | Year: 2013

For a Bose-Einstein condensate in a trap with oscillating barriers, in the resonance approximation, evolution equations are derived. Their analytical solution reveals the existence of two fundamentally different types of nonlinear conservative Rabi oscillations: (i) with periodic temporal variation of moduli and phase difference of levels' amplitudes of probability, and (ii) with monotonic temporal variation of the phase difference. It is shown that the two types can be realized for the same parameters of the scheme, but for different initial conditions. Analytical predictions are confirmed by numerical solution to the Gross-Pitaevskii equation. © 2013 American Physical Society.

Rosanov N.N.,S. I. Vavilov State Optical Institute
Optics and Spectroscopy (English translation of Optika i Spektroskopiya) | Year: 2012

The reflection of probe radiation from a smooth inhomogeneity of characteristics of a medium that propagates with a relativistic velocity is analyzed. Equations that describe the propagation of forward and backward waves in an inhomogeneous medium are derived, conditions of occurrence of a Bragg resonance are formulated, and conditions for increasing the coefficient of reflection from the inhomogeneity are discussed. © 2012. Pleiades Publishing, Ltd.

Rozanov N.N.,S. I. Vavilov State Optical Institute
Journal of Experimental and Theoretical Physics | Year: 2012

The reflection of test radiation from a smooth inhomogeneity of medium characteristics propagating with a subluminal or superluminal velocity is analyzed. The equations describing the propagation of the forward- and counter-propagating waves in such an inhomogeneous medium are derived. Quasi-phase conjugation is demonstrated in the case of superluminal inhomogeneities. The Bragg resonance conditions are formulated and the conditions for increasing the reflection coefficient of radiation from an inhomogeneity are discussed. © 2012 Pleiades Publishing, Ltd.

The possible influence of the arrangement of a sensitizing nanoobject and the charge-transfer pathway during intermolecular complex formation on nonlinear optical properties and photoconductivity characteristics of nanocomposites has been considered for a model polyimide-based nanostructured system. © 2012 Pleiades Publishing, Ltd.

Rosanov N.N.,S. I. Vavilov State Optical Institute
JETP Letters | Year: 2012

It has been shown that counterpropagating electromagnetic waves with different frequencies generate two lattices in a cubically nonlinear medium, one of which moves at a superluminal velocity. When weak radiation reflects from the superluminal lattice, the wavefront is quasi-conjugated with distortions owing to the Doppler frequency shift. These effects occur both in insulators with fast nonlinearity and in an electron-positron vacuum. © 2012 Pleiades Publishing, Ltd.

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