V. A. Kochelap

The possibility of population inversion and light gain due to electronic energy transfer from N2(A 3Σu+) ag]

Abstract This paper analyses the conditions necessary for partial electronic state population inversion in diatomics caused by electronic energy transfer from N2(A 3Σu+). It is shown that the light gain can exceed 10−4 cm−1 in highly diluted gas mixtures unde atmospheric pressure at N2(A) concentrations close to 1014 cm−3.

Kinetics of the intense chlorine chemiluminescence in a supersonic nozzle

Abstract Qualitative regularities have been established for Cl 2 intense chemiluminescence in a supersonic nozzle. Kinetic parameters for Cl 2 electronically excited states are estimated.

The possibility of long population inversion in active media for IR chemical lasers

Abstract Theoretical investigation shows that during the chemical pumping of high vibrational levels of diatomic molecules partial population inversion between these levels can exist much longer than that for the vibrational transition 1-0. In case of fast VV exchange the “long” inversion appears long after finishing of the inversion for the 1→0 transition. It lasts up to completion of the chemical pumping reaction. The calculations are made for a number of mixtures used as active media for available lasers: H2/F2, CS2/O2.

IR chemical lasers: Active medium formation via the combustion of finely disperse metal particles in an oxidizing atmosphere

Abstract The inversion and gain of IR radiation during the combustion of liquid metal droplets in an oxidizing atmosphere is investigated theoretically. The results are applied to a number of pairs of metals and oxidizers.

Effects of the condensation and scattering of radiation at the plasma-dynamic expansion of the detonation products of lead azide

The kinetics of the superluminescence of lead atoms, Pb 3P10 → 1D2 (722.9 nm) and 3P10 → 3P2 (405.8 nm), at the fast adiabatic expansion and cooling of the detonation products of lead azide Pb(N3)2 in vacuum has been studied. The effects of the condensation and scattering of light from drop clusters in an optically active heterophase medium has been analyzed in order to interpret the experiments in laser detonation plasma-dynamic systems based on metal azides.

Amplification of IR radiation in active media of excimer lasers

The Einstein coefficients and the stimulated emission cross sections have been calculated for far IR transitions of rare gas halides. The formation of inverse population has been predicted for certain vibrational-rotational levels of excimer molecules (EMs). The conclusion has been made about amplification of the IR radiation corresponding to the transitions between these levels.

Radiative lifetime and probabilities of the Cl2 optical transitions in visible and near-IR spectrum

Based on the measurements of the absolute emissivity of the thermally heated molecular chlorine in the shock wave flow, the redetermination of radiative characteristics of the Cl2 B3(Pi) o+u yields X1(Sigma) +g and A1(Pi) 1u yields X1(Sigma) +g electronic transitions was made with the aim of pre-laser studying a potential new laser active media. Reasons for errors in previous works are discussed.

Theory of solar-powered, cavityless waveguide laser

A new method is proposed for direct transformation of electronic energy of metastable species in inverse medium into energy of waveguide modes localized in a dielectric waveguide. Different waveguide configurations are examined. Numerical calculations show that transformation efficiency can be as high as 15-20%.

Cavityless dielectric-waveguide-mode generation in a weakly amplifying gaseous medium

In the paper a new method is proposed for direct transformation of electronic energy of metastable species in inverse medium into energy of waveguide modes localized in a dielectric waveguide. Different waveguide configuration are examined. Numerical calculations show that transformation efficiency can be as high as 15-20 %, allows to achieve a high level of utilization of solar energy in those spectral regions {~ 1.3 .?m) where light losses are minimal (0.2 dB/km).

Formation Of Active Medium For IR And Visible Chemical Lasers During The Combustion Of Finely Dispersed Metal Particles In The Oxidizer

Theory of population inversion, light gain and laser action is presented for the case of combustion of finely dispersed metal particles sprayed in the gaseous oxidiser. A variety of pairs metal-oxidizer is shown to be applicable as active media for IR and visible lasers.