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Vol 43, No 7 (2016)
- Year: 2016
- Articles: 5
- URL: https://journals.rcsi.science/1068-3356/issue/view/14067
Article
211-216
Application of optoelectronic negative feedback to ordering of the temporal structure of the diode-pumped Nd:YLF laser radiation
Abstract
The conditions of the generation of radiation with ordered temporal structure are determined for a solid-state laser with external negative feedback. Experiments are performed based on the Nd:YLF laser longitudinally pumped by a high-power diode array. Lasing was controlled using an intracavity electro-optic modulator based on a lithium tantalate crystal. Intensity smoothing and self-mode-locking regimes with generation of several short pulses in the axial interval are implemented by varying the delay in the feedback circuit. Under conditions of amplification above the stability boundary, the secondary electro-optic effect manifestation was detected in the lithium tantalate crystal.
217-222
Spatial distribution function of electrons and thermal neutrons in extensive air showers at sea level
Abstract
The spatial distributions of electrons and hadrons in extensive air showers, obtained during the PRISMA-32 experiment simulation, are considered. The experiment was simulated for primary protons and iron nuclei using the CORSIKA6.9 and GEANT4.10 software packages. The simulated spatial distribution functions of electrons and neutrons in the extensive air showers (EAS) at the Moscow altitude are compared to the published experimental data of the PRISMA-32 setup.
223-227
Study of the algorithm for time-frequency analysis of the measurement series of night mesospheric ozone emission spectra at millimeter waves
Abstract
An algorithm for time–frequency analysis of irregular time data series is developed and tested to study variations of night mesospheric ozone radiation, observed at millimeter waves from the Earth’s surface. Some results of numerical and field experiments are presented.
228-231
Density and velocity distribution function for freely expanding matter
Abstract
For a system of noninteracting particles being initially in a spherical volume of a given radius, the density evolution and the distribution function are considered for various initial conditions. In particular, the conditions under which the density during free expansion of a sphere-shaped cloud of noninteracting particles remains spatially constant, while the boundary remains sharp, are determined. Alternative variants of free spherically symmetric expansion of a particle cloud are considered. The results of this consideration are applicable to various problems of the centrosymmetric explosion, and have astrophysical applications.
232-236