Magneto-Optical Cavity-Type Resonators as Controllable Narrow-Band Sources of Infrared Radiation
[1]
Vasyl Morozhenko, V. Lashkaryov Institute of Semiconductor Physics, Kyiv, Ukraine.
In the article, the theoretical studies of thermal radiation of the magneto-optical cavity-type resonators were carried out. Attention was paid to dependence of thermal radiation spectrum on both magnitude of external magnetic field and on optical parameters of the resonator. The aim of these studies was to investigate a possibility of using such resonators as sources of radiation of the middle and far infrared ranges. For theoretical description of thermal radiation, the matrix method of multi-beam summation that takes into account the Faraday rotation was used. It was found, that the spectrum of thermal radiation of the resonators is narrow-band. The analytical formulas were obtained that describe the dependencies of the amplitude, spectral position and width of the emission line on the optical parameters of the resonator. As result of analysis, the optical parameters of the resonator were determined for which the amplitude of the emission line is maximal and reaches a radiation intensity of the blackbody at the same temperature. Influence of an external magnetic field on the spectrum of thermal radiation of the magneto-optical cavity-type resonators was investigated theoretically in the Faraday geometry. It was found, that a magnetic field leads to splitting of the emission line into two lines, which diverge into the short-wave and long-wave regions of the spectrum when the field is increasing. These results show, the magneto-optical cavity-type resonators can be used as the narrow-band magnetically controlled radiating elements with modulated emission line amplitude or dynamically tunable spectrum. They can be a basis for development of new generation infrared sources for the middle and far infrared ranges. Such radiation sources can be used in the optical gas analyzers and analyzers of matter, optical sensors, infrared spectrometers etc.
Emissivity, Thermal Radiation, Infrared Sources, Faraday Effect, Magneto-optical Resonators
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