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Proceedings Paper

Fourier optics for acousto-optical spectrometers with nonlinearity correction of the Bragg cell frequency response
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Paper Abstract

Large, greater than about 1 Ghz, bandwidth acousto-optical spectrometers are based on Bragg cells made by LiNbO3 working in birefringent regime. It is well known that the frequency response of this kind of cells is nonlinear. The purpose of this paper is the study of possible solutions for the correction of this nonlinearity. We studied several different optical design. We analyzed 3, 4 and 5 lenses optical design with particular care to distortions and quality of the reimaging. About distortion we designed some lenses slightly off-axis in order to achieve a partial compensation of the asymmetric distortion in the spectra introduced by the non-linear frequency response of the Bragg cell. A solution involving all cylindrical lenses is also briefly shown along with some practical drawback leading to the rejection of such an option. Finally a trade-off is performed in order to balance difficulty and cost of realization, the optical quality, and the true residual distortion. For multichannel Bragg cells the differential distortion between the various channels is also analyzed.

Paper Details

Date Published: 8 February 2002
PDF: 7 pages
Proc. SPIE 4486, Infrared Spaceborne Remote Sensing IX, (8 February 2002); doi: 10.1117/12.455104
Show Author Affiliations
Roberto Ragazzoni, Osservatorio Astronomico di Padova (Italy)
Vincenzo Natale, CNR (Italy)

Published in SPIE Proceedings Vol. 4486:
Infrared Spaceborne Remote Sensing IX
Marija Strojnik; Bjorn F. Andresen, Editor(s)

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