Spectral-Energy Characteristics of Repetitively-Pulsed Sources of Powerful Infrared Radiation with Sapphire Shells

The study focuses on a mathematical model of the discharge in a mixture of cesium, mercury and xenon, the discharge being stabilized by a system of two sapphire shells. The model is used to examine the radiation characteristics of sources of powerful infrared radiation in the ranges 1.8...4.2 µm and 3.0...5.0 µm. The study gives data on the optical absorption coefficient as a function of temperature, pressure, and the ratio of the components of the metal-gas plasma. Moreover, the significant role of the line component in the formation of a complex discrete-continuous structure of the absorption and radiation spectra is shown. We also did research into the transformation of spectral distributions of repetitively-pulsed discharges with the pulse burst pass. The fact of a significant redistribution of radiation between discrete and continuous components is established. The influence of the mass ratio of the components and the geometry of the sources on the peak radiation power (PRP) is investigated. The study shows that an increase in the proportion of cesium in the mixture can lead to both an increase in the PRP and its decrease as a function of the electric power, that is determined by the change in the contribution to the radiation transfer of the line and continuous components with a change in the optical density of the plasma. Results suggest that at an electric power of the order of 2 kW/cm, it is possible to select such parameters of the radiation source that provide the PRP in the two specified ranges at the level of 120 and 60 W/cm, which is confirmed by experimental data with an accuracy of 8...15 %

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