Acousto-optic spectrometer for a weak optical signal processor

Alexei K. Zajtsev

doi:10.1117/12.262563

27 December 1996 Acousto-optic spectrometer for a weak optical signal processor

Alexei K. Zajtsev

Proceedings Volume 2969, Second International Conference on Optical Information Processing; (1996) https://doi.org/10.1117/12.262563
Event: Second International Conference on Optical Information Processing, 1996, St. Petersburg, Russian Federation

Abstract

The problem discussed in the paper is devoted to developing of acousto-optic spectrometers. In contrast to other types of spectral devices they are very compact due to dynamic nature of scanning. Furthermore they may have large angular apertures. For this purpose, the fitter anisotropic interaction type close to collinear is most preferable. The electronic nature of scanning allows us to achieve the maximum possible analyzing speed, to change analyzing time and to process nonstationary spectrums. In the paper there are presented some characteristics of a laboratory prototype of acousto-optic spectrometer operating in the filter regime of quasi-collinear diffraction in TeO₂ crystal. In the analyzing bandwidth (Delta) (lambda) equals 0.6-1.2 mm the resolution is from (delta) (lambda) equals 1.2 nm to (delta) (lambda) equals 5.8 nm. In the regime of the lowest analyzing speed, the threshold sensitivity is 1.3* 10^-10 W. It is found that the extension of analyzing time by 10 allows the threshold sensitive power be less by 5 dB. There are presented some experimentally measured radiating spectrums of several sources and the absorption characteristics of some substances.

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Alexei K. Zajtsev "Acousto-optic spectrometer for a weak optical signal processor", Proc. SPIE 2969, Second International Conference on Optical Information Processing, (27 December 1996); https://doi.org/10.1117/12.262563

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KEYWORDS

Spectroscopy

Acousto-optics

Diffraction

Acoustics

Optical signal processing

Absorption

Crystals

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