Apodization of the incident light beam by an optimized quasi-Gaussian profile shifted along an aperture of the acousto-optical cell with appreciable acoustic losses

Alexandre S. Shcherbakov; Alexander Laskin; Ana Virginia Hanessian de la Garza

doi:10.1117/12.2001404

24 October 2012 Apodization of the incident light beam by an optimized quasi-Gaussian profile shifted along an aperture of the acousto-optical cell with appreciable acoustic losses

Alexandre S. Shcherbakov, Alexander Laskin, Ana Virginia Hanessian de la Garza

Author Affiliations +

Proceedings Volume 8412, Photonics North 2012; 84121C (2012) https://doi.org/10.1117/12.2001404
Event: Photonics North 2012, 2012, Montréal, Canada

Abstract

It is well known that an appropriate apodization of the light beam within acousto-optical data processing makes it possible to increase the potential dynamic range of a system up to 40 dB and more. Customary, the Gaussian apodization is used when a light beam incidents on a rectangular uniform operative aperture of acousto-optical cell. However, modern acousto-optics exploits often rather high-frequency radio-wave signals in a view of increasing the frequency bandwidth by itself or/and growing the time-bandwidth product inherent in a cell. Anyway, similar acoustooptical cells operate with such frequencies that acoustic losses become already pronounced, so that the effect of these losses along an aperture of a cell has to be taken into account. Typically, acceptable level of the acoustic losses accounts about 3 − 6 dB per cell’s aperture. By this it means that the expected no-uniformity of distributing the acoustic energy is now not negligible. To obtain really optimized profile of the incident light beam apodization the expected influence of acoustic losses ought to be analyzed and estimated. In connection with aforementioned no-uniformity or asymmetry, one can propose exploiting a quasi-Gaussian profile of the incident light beam reasonably shifted relative to the center of an aperture of the acousto-optical cell with appreciable acoustic losses.

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Alexandre S. Shcherbakov, Alexander Laskin, and Ana Virginia Hanessian de la Garza "Apodization of the incident light beam by an optimized quasi-Gaussian profile shifted along an aperture of the acousto-optical cell with appreciable acoustic losses", Proc. SPIE 8412, Photonics North 2012, 84121C (24 October 2012); https://doi.org/10.1117/12.2001404

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KEYWORDS

Acoustics

Signal attenuation

Apodization

Fourier transforms

Acousto-optics

Light scattering

Phonons

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