Main scientific results
The theory of superfast mode of operation of quantum-dot semiconductor optical amplifiers has been developed. Formulae have been obtained, which relate the maximum bit (pulse) recurrence rate in the amplified flux and the average pulse energy at the output of the amplifier with the density of pumping current for this amplification mode. This result can be used in the development of the new-generation superfast semiconductor devices for applications in optical communications and information processing.
A conceptually new scheme for generation of high-power coherent gamma radiation has been proposed, in which jointly propagating beams of high-energy electrons and positrons interact with a counter pulse of high-power laser radiation. This scheme can find application for developing high-power sources of VUV and X-ray coherent radiation and sources of gamma quanta using relativistic beams of charged particles.
The theory of wide-aperture KrF amplifiers has been developed, and calculation of a chain of such amplifiers has been carried out with simultaneous amplification of long and ultrashort pulses with the petawatt level of output power in the ultrashort pulse and the megajoule level of energy in the long pulse. This result can find application in developments of high-power drivers for laser fusion in fast-ignition circuits and creation of petawatt laser complexes.
A new scheme of an active interferometer for photodetection of weak optical signals using preamplification in the scheme of optical four-wave mixing has been developed. This result is important for creation of new-generation quantum receivers of ultraweak signals.
It has been theoretically shown that a beam of recoil atoms with the characteristic velocity of the order of several centimeters per second and the relative width of velocity distribution Δν/ν of the order of 10-3 is formed on the condensate of atoms in the trap during the forced light scattering. This result makes it possible to determine the number of particles in the condensate, the chemical potential of gas and the relaxation-rate time of above-condensate particles.
A novel scheme of linear optical Ramsey resonance for an arbitrary wavelength of a laser and the fixed lattice constant of two lattices located between the source of molecular beam and the detector of signal has been proposed. This enables the use of the already existing lattices for arbitrary optical transition in optical frequency references.
The theory has been developed for determining the dielectric function of thin-film heterogeneous media with various randomly oriented ellipsoidal particles near the interface with the other medium. These results can be used for creating new heterogeneous media with the preset dielectric function and for developing nanolasers.
General theory of the propagation of electromagnetic waves in media with arbitrary anisotropy of the dielectric and magnetic permeabilities has been developed. The theory can find application in the nanophysics of magnetic crystals.
It has been shown theoretically that the effect of phase self-modulation in the information-transfer fibre-optical channel due to the nonlinear Kerr effect can lead to a significant degradation of the quality of synchronization of identical chaotic semiconductor lasers. It has been shown that in-plane microresonators, of the shape strongly differing from a sphere or a cylinder and of the size comparable with the wavelength, can admit resonance modes, whose quality factor can be several tens up to a hundred or higher. These studies can be used in the development of semiconductor devices intended for hidden transmission of information and in the creation of novel types of microresonators.