25 Result(s)
within
M. V. Andreev
Physics
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Article
Pulsed CO2 Laser Pumped by a Longitudinal Discharge in an Alternating Magnetic Field
An original technique is suggested for pum** a pulsed CO2 laser by a longitudinal discharge in an alternating magnetic field. A small CO2 laser with active medium ∼200 mm long, pulse energy of ∼30 mJ, and effic...
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Article
Interaction of Nitrogen Dioxide by 222 nm Laser
The process of broadband KrCl laser λrad = 222 nm interaction with nitrogen dioxide in the atmosphere is considered. During the laser pulse, photofragmentation of NO2 occurs, followed by resonant excitation of se...
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Article
Improving the Stability of the Optical System of a Laser Source Based on a Position-Sensitive Detector
Results of numerical and experimental studies on monitoring and control for optical elements of an electric discharge KrF laser by the method of density-based spatial clustering of applications with noises (DB...
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Article
Discharge KrF Laser with a High Specific Energy of Radiation
We report the results of experimental and numerical investigations of a discharge KrF laser with specific pump power of 3.5 and 7 MW/cm3; generation is obtained with specific radiation pulse energy of about 6 and...
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Article
Influence of Discharge Plasma Inhomogeneities on the Characteristics of KrF-Laser Radiation
Results of studies of the electric-discharge KrF laser with a specific pulse energy of ~6 J/L and an internal energy efficiency of more than 4% are presented. The formation of instabilities of various types in...
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Article
Photometric Studies of the Intermediate Polar DO Dra in 2008 and 2019
An analysis is presented of photometric observations of the intermediate polar DO Dra obtained during an epoch of significant reduction in its outburst activity for different average brightnesses of the system...
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Article
Radiation Intensity Profiles at Different Stages of the Formation of Apokamp Discharge
Experimental studies of the heat release processes in the apokamp discharge were carried out via the plotting of intensity charts. The procedure was verified with measurement techniques similar to those used i...
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Article
Numerical Method of Cavity Adjustment by the Output Beam Image
Results of numerical and experimental studies of the control of optical elements of a KrF laser cavity by use of the image processing method are presented. Different methods of beam image binarization for dete...
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Article
Increasing the Sensitivity of Lidar Systems Based on the LF/LIF Method
The results of studies on the development of laser sources in the UV and IR spectral ranges for the lidar systems operating on the basis of a method of laser fragmentation with subsequent laser-induced fluores...
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Article
Diagnostics of small-scale details on asteroid’s surface from the fast spectrophotometry data
To study the mineralogical composition of an asteroid’s surface with a technique of colorimetry of small-scale details, we propose fast spectrophotometry with a low-resolution imaging spectrograph and a time r...
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Article
High-frequency variations of spectral lines in cromospherically active stars 61 cyg AB
We report on the detection of rapid variability in subsecond mode in the Balmer lines of hydrogen, lines Ca II H,K, and b Mg I triplet in chromospherically active stars 61 Cyg A, B. The spectral observations o...
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Article
Photometric studies of comet C/2009 P1 (Garradd) before the perihelion
The results of the photometric observations of comet C/2009 P1 (Garradd) performed at the 60-cm Zeiss-600 telescope of the Terskol observatory have been analyzed. During the observations, the comet was at the ...
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Article
P/2010 TO20 LINEAR-Grauer: A comet in transition from Centaurs to the Jupiter family
The object P/2010 TO20 LINEAR-Grauer, discovered at a heliocentric distance of over 5 AU, and at first classified as a Trojan, is now believed to be a comet. This paper reports special observations of the obje...
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Article
Slitless spectrograph for small telescopes: First results
A slitless UBVR spectrograph has been built for use on small telescopes. Test observations on the Zeiss-600 telescope at the Terskol peak demonstrated that the spectrograph is an efficient instrument for studying...
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Article
Fast spectrophotometry of the flare star EV lacertae
We present the results of fast spectrophotometry for two flares on EV Lac with a time resolution of 8 s and a spectroscopic resolution R ∼ 100. The observations were performed in May and August 2010 with a slitle...
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Article
Photometry of the dwarf nova V503 Cyg in 2010. Orbital and other periods
Photometric studies of the dwarf nova V503 Cygni have been conducted for 29 nights at the Crimean Astrophysical Observatory and at the Terskol Observatory during 2010. We detected none of the socalled “negativ...
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Article
Narrow-band tunable laser system for a lidar facility
A unique ultraviolet laser system has been developed for a lidar intended to detect nitrogen oxide molecules in the atmosphere. The electric-discharge KrF laser system is capable of producing a highly coherent...
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Article
The rotation period of comet 29P/Schwassmann-Wachmann 1 determined from the dust structures (Jets) in the coma
The results of the photometric observations of comet 29P/Schwassmann-Wachmann 1 are analyzed. The comet demonstrates substantial activity at heliocentric distances larger than 5 AU, i.e., outside the water ice...
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Article
Pulsations of optical radiation during the flare of YZ CMi occurred on February 9, 2008
One of the most powerful and long-lived flares on the active red dwarf YZ CMi is considered. The flare was observed in the U band at the Terskol Peak Observatory on February 9, 2008. During the formation of th...
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Article
Astrometric results of observations at Russian observatories of mutual occultations and eclipses of Jupiter’s Galilean satellites in 2009
In 2009, in five Russian observatories photometric observations of Jupiter’s Galilean satellites during their mutual occultations and eclipses were carried out. Based on these observations, an original method ...
