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Article
Laser Analysis of the Evaporation Dynamics of Water Spin Isomers
The content of H2O spin isomers in saturated vapor during its fast evaporation from the surface of water in a cell at room temperature has been analyzed. The experiment was performed using the two-compartment sch...
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Article
Monitoring the Baric Modulation of Gas Concentration in the Baksan Neutrino Observatory Tunnel in the Elbrus Region Using Differential Absorption Lidar
The concentrations of the gases 12CO2, 13CO2, СН4, and Н2О and the trends of Earth degassing under changing atmospheric pressure were analyzed remotely for the first time using a differential absorption lidar. To...
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Article
New Nonlinear Optical Effect: 20-Fold Local Increase in Intensity in the Field of a Backward SRS Picosecond Pulse in Heavy Water
We report for the first time, to our knowledge, the discovery of a new nonlinear optical effect in a stimulated Raman scattering (SRS) laser in heavy water as a Raman active medium: a 20-fold local increase in...
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Article
Multiple Increase in the Efficiency of Picosecond Stimulated Raman Scattering Excited by Bessel Laser Beams in Water
Stimulated Raman scattering of second harmonic picosecond pulses (60 ps, 532 nm) of an Nd3+:YAG laser in water when focusing a Bessel beam behind a conical concentrator with the displacement of the beam caustic t...
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Article
LiDAR Sensing of Aerosols Induced by Air Ions
A strong correlation between the LiDAR aerosol backscattering signal and air ion concentration in an enclosed underground room is detected for the first time. Nowadays, air ions monitoring is considered to be ...
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Article
Modulation of Recombination Radiation in Quantum Wires by Electric Field and the Possibility of Its Application in Quantum Electronics
The cross section for the process of single-photon recombination of free charge carriers in the 1D geometry of a thin quantum wire in a strong longitudinal electric field is calculated. It is established that ...
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Article
Stimulated Low-Frequency Scattering of Laser Radiation in an Aqueous Suspension of Viruses in the Frequency Range 1–60 GHz
Stimulated low-frequency scattering spectra in a suspension of two morphologically similar viruses, Alternanthera mosaic virus and Potato virus X the frequency range 1–60 GHz, were calculated and successively ...
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Article
Underwater Lidar: Remote Sensing in Strongly Scattering Media
A lidar backscattering signal from an opaque target object, passed through a 9-m water layer with scattering meshes on the laser beam path, has been detected (for the first time, to the best of our knowledge) ...
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Article
New Lasing Mode of a Diode Laser: A 200-Picosecond Leading Edge of a Nanosecond Pulse
A unique rangefinder that, as far as we know, was not mentioned in previous publications has been studied. It is based on an injection diode laser with an eye-safe radiation density (below 1 μJ/cm2) and a single-...
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Article
Frequency Shift for the Stimulated Low-Frequency Raman Scattering in Aqueous Suspensions of Viruses with a Change in the Laser Pump Intensity
A shift of the frequency of resonances of stimulated low-frequency Raman scattering (SLFRS) of laser radiation in liquid suspensions of viruses with a change in the pump wave intensity has been found for the f...
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Article
Drone Based Fluorescence LIDAR for Agriculture Fields in Situ Diagnostics
Ultracompact (~300 g) fluorescence LIDAR is developed to be installed on a small drone for remote sensing of agricultural fields. The LIDAR is based on a diode laser (405 nm, 150 mW) and a mini spectrometer al...
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Article
Lidar Monitoring of Magmatic Activity in the Small Chamber of the Elbrus Volcanic Center
In this paper, the results of lidar monitoring of magmatic aerosol variation are presented. The lidar was installed in a hot dead-end tunnel at the end of the auxiliary adit of the Baksan Neutrino Observatory ...
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Article
Air Convection Reversal in a Hot Tunnel above the Elbrus Volcano Chamber
A unique geophysical phenomenon, i.e., an inverted vertical air temperature profile (3–5°C at the 1.5 m altitude) in a tunnel above the Elbrus volcano chamber, is discovered for the first time to our knowledge...
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Article
Dynamic Stimulated Low-Frequency Light Scattering in a Nanodispersed Liquid Medium
For the first time, stimulated dynamic scattering of a light wave in a liquid nanodispersed medium is observed, which is caused by phase modulation of the dipole moment of the suspension nanoparticles subjecte...
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Article
Recombination Emission of Quantum Wires in Electric Field and Prospects for Its Lasing
It is found that one-photon recombination in thin quantum wires in longitudinal electric field in monochromatic photon emission, despite the classical degree of freedom of the electron and hole. It compares fa...
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Article
Spatial Regularization of Green’s Function in an Electric Field and the Quasi-Classical Complex Energy Spectrum in Quantum Dots
It is shown that the spatial regularization of Green’s function (in fact, the introduction of a finite source radius) in an electric field makes it possible to solve the problem of calculating the spectrum of ...
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Article
Estimation of the Influence of Meteorological Factors on the Aerosol Lidar Signal in Tunnels above the Elbrus Volcano Chamber
A harmonic analysis of lidar aerosol backscattering, Earth’s crust deformation data (measured by a laser interferometer strainmeter), and meteorological factors (air relative humidity, atmospheric pressure, an...
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Article
Stimulated Raman Scattering in Suspensions of Alternanthera Mosaic Virus and Potato Virus X in the Frequency Range of 1–15 GHz
Low-frequency stimulated Raman spectra in suspensions of Alternanthera mosaic virus and Potato virus X are calculated and measured. The discrepancy between the calculated and measured frequencies of the Raman ...
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Article
LIDAR Detection of Aerosols in the Tunnel above the Elbrus Volcano Chamber
300-percent spikes of lidar backscattering are detected for the first time in air of a dead-end underground adit over the Elbrus volcano magma chamber. The adit is at the Baksan Neutrino Observatory (BNO). It ...
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Article
High-Frequency (MHz) Ignition of Commercial Flash Lamps for Solid State Lasers
A multiple (from 20 to 3 kV) decrease in the ignition threshold of commercial flash lamps for solid-state lasers under HF pum** at a megahertz frequency has been detected. It has been found that, upon water ...
