V. A. Shcheglov

Role of Weak Energy Fluxes in the Formation of Coherent Structures in Macromolecular Media

Processes underlying the formation of coherent structures in macromolecular media are discussed. The influence of weak energy fluxes (electromagnetic waves and cosmic particles) on the characteristics of macromolecular media is considered.

Two mechanisms of electromagnetic-radiation interaction with information-carrying biomacromolecules

The influence of weak electromagnetic radiation on biological molecules as coupled oscillators is considered. Dependences of the natural resonances of biomolecules on electromagnetic-signal shape and features of biomolecule structures are investigated.

Classical field theory methods in laser physics. I. Radiation field in empty resonators and resonators with inhomogeneous active medium

One of the possible interpretations of laser radiation inside a resonator is given. It is based on the method of normal coordinates. In the course of presentation, the method is gradually complicated. This is accompanied by refinement of the interpretation of laser radiation in a resonator.

Influence of the initial conditions on the dynamics of nonlinear systems

The nonlinear dynamics of nondissipative systems of hydrodynamic type that are subjected to small, albeit finite, perturbations in the initial conditions is considered. The behavior of these systems is determined by equations of low-energy hydrodynamics with the potential obeying the Poisson equation. The relation of the hydrodynamic system under study to systems whose dynamics is determined by the Schrödinger equation and the wave equation is discussed.

Langmuir oscillations under nonequilibrium conditions

The influence of external ionization sources on the characteristics of Langmuir oscillations in a partially ionized plasma is considered. It is demonstrated that in the case of continuous sources of ionization the nonlinear Langmuir oscillations are nonharmonic and are determined by the Airy equation.

Classical field theory methods in laser physics. III. Propagation of laser radiation in vacuum outside a resonator

The third Part of our work continues the analysis of the problem considered in Parts I and II [J. Russ. Laser Res.,17, 205 (1996);18, 2 (1997)]. We continue the search for the answer to the question: What is laser radiation from the viewpoint of the classical theory of wave fields? Here, we give one of the possible interpretations of propagation of laser radiation in vacuum outside a resonator from both the nonrelativistic and relativistic points of view. The relation between the metric and the radiation field structure is noted. Moreover, the third Part contains the conclusion concerning the work as a whole. It presents the main observations that may be useful for further studies of the problem.

Analytical technique for calculation of mirror surface parameters in “HEX-DARR” resonator for lasers with a ring active medium

Within the geometrical optics approximation, we consider a class of mirrors (with surfaces formed by rotating second-order curves) which enables an extension of the range of possible beam conversions in optical systems. The formulas used in the calculations are quite simple. Based on this approach, we worked out and presented a complete analytical algorithm for calculation of the mirror surface parameters in a “HEX-DARR” resonator. To check the algorithm, a numerical calculation of an optical system is carried out for a specific set of initial data. The results obtained confirm the accuracy of the equations derived and the efficiency of the algorithm.

On the possibility of phase conjugation of cw multifrequency HF-laser radiation using Bragg scattering in a HBr-Xe mixture

We consider an approach to phase conjugation (PhC) of multifrequency radiation of a cw HF chemical laser (HF-CCL) using Bragg scattering in a resonantly absorbing medium. The choice of working components of this medium, HBr and Xe, is analyzed at length. Numerical calculations are performed employing a mathematical model presented in this paper; the reflectivity is plotted as a function of the component concentration ratio, the intensities of waves determining the volume hologram in a WFI cell, and the angle of their convergence. We consider the problem of cooling the medium by mixture circulation. The calculations show that the approach suggested is a candidate for implementing the PhC of a high-power multifrequency HF-CCL.

Features of propagation of laser radiation in media with small-scale periodic inhomogeneities

The problem of laser-radiation propagation in media with small-scale periodic phase inhomogeneities is considered analytically. Relying on our analytical treatment and numerical calculations performed in the diffraction approximation, we demonstrate the effect of periodic self-reproduction of the field structure of radiation during its propagation in media with small-scale periodic inhomogeneities, which is similar to the Talbot effect in a homogeneous medium.

Analogues of Coherent and Dissipative Structures in Social and Historical Processes

An analogy between social and hydrodynamic processes is developed. The relation of the state system to the passionarity theory suggested by L. N. Gumilev is discussed.