Abstract
A promising avenue in the development of high-energy pulsed chemical HF/DF lasers and amplifiers is the utilization of a photon-branched chain reaction initiated in a two-phase active medium, that is, a medium containing a laser working gas and ultradispersed passivated metal particles. These particles are evaporated under the action of IR laser radiation which results in the appearance of free atoms, their diffusion into the gas, and the development of a photon-branching chain process, which involves photons as both reactants and products. The key obstacle here is the formation of a relatively large volume (in excess of 103 cm3) of the stable active medium and filling this volume homogeneously for a short time with a submicron monodisperse metal aerosol, which has specified properties. In this paper, results are presented for an extensive study of laser initiation of a photon-branched chain reaction in a gas-dispersed H2–F2 medium.
Highlights
Theoretical investigations [1,2,3,4,5,6,7,8,9] have been carried out for the problem of photon branching in a two-phase chemically active media
If the number of emitted photons exceeds the number of those used in the initiation process, one can speak of a new type of branched chain reaction: photon-branched chain reaction (PBCR)
The properties of an aerosol as an active medium of a pulsed chemical HF laser based on a photon-branched reaction should satisfy a number of requirements, which can be divided into two independent groups
Summary
Theoretical investigations [1,2,3,4,5,6,7,8,9] have been carried out for the problem of photon branching in a two-phase (consisting of a gas and disperse particles) chemically active media. The wave approach for the description of a pulsed chemical HF laser amplifier based on a PBCR in an unstable telescopic cavity enables the detection of interesting optical effects in an active two-phase medium of H2–F2–O2–He and Al particles and of the new properties of the laser. We present an overview of the optimal and permissible parameters of the disperse component of HF active medium and give recommendations for the experimental realization of PBCR in a chemicallyactive gas-disperse medium
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