Detection of narrow 'laser' lines hidden by spatially inhomogeneous broadening in the radiation of stellar atmospheres

Physics

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Laser Outputs, Line Spectra, Spectral Line Width, Stellar Atmospheres, Stellar Spectra, Optical Heterodyning, Stellar Radiation

Scientific paper

The paper examines methods of detecting narrow spectral lines, hidden by spatially inhomogeneous frequency shifts, in the radiation of distant sources. The fundamental possibility of using the Brown-Twiss (1957) correlational method and the method of optical heterodyning with independent heterodynes is analyzed. The normalized cross correlation function in the plane of two receivers of radiation from a distant source having spatially inhomogeneous spectral broadening is calculated. Estimates are made of the signal/noise ratio for both methods in application to sources - 'laser' regions in a stellar atmosphere - in the presence of strong spatial broadening of the spectrum due to rotation.

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