13 February 2008 Potential dynamic range in a scheme of the acousto-optical spectrometer providing light beam apodization for a large-aperture crystalline cell with linear acoustic losses
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Abstract
We develop our previous considerations for one of the most important problems related to optimizing the performance data of a new acousto-optical spectrometer for the analysis of radio-astronomical signals. The main attention is paid to estimating the side lobes of light distributions inherent in an individual resolvable spot in the output Fourier plane, governing the dynamic range of that spectrometer. At first, we analyze the Akhieser mechanism responsible for linear attenuation of both longitudinal and shear elastic waves in isotropic solid states. Similar analysis can be directly applied to crystalline materials as well in all the cases of passing elastic wave along the acoustic axis in crystals. Then, we estimate the influence of the acoustic attenuation along a large-aperture acousto-optical cells operating in a one- and two-phonon light scattering regimes. In so doing, the optimal operating points are discussed for both these regimes. Finally, the combined effect of the acoustic attenuation and the incident light beam apodization is studied from the points of view of optimizing the levels of side lobes and minima in light distribution of an individual resolvable spot in focal plane of the integrating lens and, consequently, estimating potential limitations of the dynamic range.
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Alexandre S. Shcherbakov, Alexandre S. Shcherbakov, Abraham Luna Castellanos, Abraham Luna Castellanos, Eduardo Tepichin Rodriguez, Eduardo Tepichin Rodriguez, Sandra E. Balderas Mata, Sandra E. Balderas Mata, } "Potential dynamic range in a scheme of the acousto-optical spectrometer providing light beam apodization for a large-aperture crystalline cell with linear acoustic losses", Proc. SPIE 6890, Optical Components and Materials V, 689018 (13 February 2008); doi: 10.1117/12.764174; https://doi.org/10.1117/12.764174
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