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

Roberto Ragazzoni; Vincenzo Natale

doi:10.1117/12.455104

8 February 2002 Fourier optics for acousto-optical spectrometers with nonlinearity correction of the Bragg cell frequency response

Roberto Ragazzoni, Vincenzo Natale

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Proceedings Volume 4486, Infrared Spaceborne Remote Sensing IX; (2002) https://doi.org/10.1117/12.455104
Event: International Symposium on Optical Science and Technology, 2001, San Diego, CA, United States

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.

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Roberto Ragazzoni and Vincenzo Natale "Fourier optics for acousto-optical spectrometers with nonlinearity correction of the Bragg cell frequency response", Proc. SPIE 4486, Infrared Spaceborne Remote Sensing IX, (8 February 2002); https://doi.org/10.1117/12.455104

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KEYWORDS

Bragg cells

Spectrometers

Charge-coupled devices

Lenses

Acoustics

Acousto-optics

Crystals

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