51 Result(s)
within
V. A. Donchenko
Physics
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Article
Peculiarities of Lasing in Solutions of R6G with Agglomerated Metallic Nanoparticles
A physical interpretation is given for the experimentally observed substantial lowering of the lasing thresholds and the blue shift of the peak of the stimulated emission spectrum of a solution of the laser dy...
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Article
Influence of scattering on superluminescence in composites dye solution – nanoparticles
Spectral and energy luminescence characteristics of R6G dye solutions in ethanol with addition of Ag nanoparticle suspensions in different aggregate states are experimentally investigated. It is demonstrated t...
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Article
Far-field temporal dynamics of a laser beam passed through a thin nanocolloidal layer
We report on the experimental results of the temporal dynamics and formation of far-field diffraction patterns obtained when a low-intensity laser beam passes through a thin cell with metallic nanocolloids. Th...
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Article
Number of electric charges per unit mass of a substance
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Article
Investigation of time characteristics of photodetectors based on Ge/Si nanoheterostructures
Results of investigations into the time characteristics of photosensitive layers based on Ge/Si nanoheterostructures excited by femtosecond laser pulses with a wavelength of 1.55 μm are given. It is demonstrat...
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Article
A decrease in the superluminescence threshold of composites of an organic dye with nanoparticles
It is established that admixture of Ag, Al, Cu, Ni, Zn, and Fe 3 O 4
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Article
Angular distribution of superfluorescence energy of drops for the two-photon absorption of nano-and femtosecond laser pulses
Results of investigations into the spectral, energy, and spatial characteristics of rhodamin 6G fluorescence of a liquid drop are presented for the two-photon absorption of nano-and femtosecond laser pulses. I...
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Article
Fluorescence of a Liquid Drop with a Dye Excited by Femtosecond Laser Pulses
Results of investigations into the spectral and power characteristics of two-photon fluorescence of a liquid drop with the Rhodamine 6G dye irradiated by femtosecond laser pulses are presented. It is demonstra...
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Article
Energy Parameters and Spectral Characteristics of Lasing of a Liquid Dye Drop Incorporating Nanoparticles
The spectral characteristics and the energy parameters of the fluorescence of a liquid rhodamine-6G dye drop incorporating suspended TiO2 nanoparticles are presented. It is demonstrated that the lasing threshold ...
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Article
Effects of Stimulated Radiation in Liquid Particles and Drops with a Dye
Results of our investigations of stimulated radiation in polydisperse aerosols and drops of dye solutions aimed at develo** methods of Raman spectroscopy of aerosols and creating efficient laser sources and ...
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Article
Remote Detection of Asymmetric Dimethylhydrazine in the Atmosphere
The possibility of remote atmospheric detection of an ecotoxicant (asymmetric dimethylhydrazine) by means of a fluorescing mark is considered. The effect of asymmetric dimethylhydrazine on the spectral-lumines...
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Article
Optical diagnostics of the atmosphere
The theoretical principles of the method of polarized laser probing of an aspherical atmospheric aerosol, oriented in space, are considered. An approach to estimating the effectness of methods of spectroscopic...
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Article
Monitoring of electromagnetic fields in the environment. II. Fluctuations in the parameters of atmospheric electricity
The problems of determining and investigating the informative parameters of atmospheric electricity are discussed. It is shown that short-period variations in atmospheric electricity are ecologically significa...
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Article
Calculation of parameters of plane-transverse inhomogeneities in waveguides with complex cross sections in the multimode regime
We present a method for studying plane-transverse inhomogeneities in waveguides with complex cross sections in the regime of incidence of several propagating and nonpropagating waves on an inhomogeneity. Vecto...
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Article
Spontaneous soliton production by an optical pulse with a nonlinear shift of the carrier frequency
The perturbed nonlinear Schrödinger equation model is used to investigate the decay of a strong optical pulse in an absorbing medium with consideration of the nonlinear frequency shift of the pulse. The regula...
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Article
Spontaneous soliton formation with a saturated nonlinearity in a weakly nonlinear medium
We have observed the effect of a saturated nonlinearity on the process of spontaneous soliton formation in a weakly nonlinear medium with absorption. The characteristic properties of the problem are investigat...
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Article
Propagation of a soliton-like pulse in a weakly nonlinear medium
Numerical methods are used to study the decay dynamics of a soliton-like signal in a medium with a cubic nonlinearity (using the nonlinear Shrödinger equation). We consider the influence of the initial pulse a...
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Article
Interaction of electromagnetic waves with fractal structures
A review and analysis is presented of the state of theoretical and experimental investigations of the problem of the interaction of electromagnetic waves with different inhomogeneous media possessing fractal p...
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Article
Calibration of a holographic disdrometer
The factors giving rise to error in the determination of microparticle size from an image-plane holographic disdrometer are examined. A method of calibration is proposed and experimentally confirmed that lower...
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Article
Monitoring environmental electromagnetic fields. 1. Remote-sensing methods
This paper discusses monitoring electromagnetic fields (natural and artificial) in the atmosphere. Methods are described for remote sensing of the atmosphere and surface in order to examine static and alternat...
