Optimal geometry for Sagnac and Michelson interferometers used as spectral imagers

Yann Ferrec; Jean Taboury; Herve Sauer; Pierre H. Chavel

doi:10.1117/1.2395923

1 November 2006 Optimal geometry for Sagnac and Michelson interferometers used as spectral imagers

Yann Ferrec, Jean Taboury, Herve Sauer, Pierre H. Chavel

Author Affiliations +

Optical Engineering, Vol. 45, Issue 11, 115601 (November 2006). https://doi.org/10.1117/1.2395923

Abstract

High-étendue Fourier transform imaging spectrometers can be useful tools for acquiring airborne hyperspectral images, since they do not need moving parts and, as Fourier transform spectrometers, they benefit from the Felgett advantage. The Sagnac interferometer and the Michelson interferometer with dihedrons can be used in such an instrument. These two interferometers act very similarly on the entering beam, and in particular they both work with fringes of equal inclination. This property enables them to benefit from the Jacquinot advantage, too. Nevertheless, to fully benefit from this advantage, it is necessary to maximize the geometrical étendue accepted by the interferometer. From this point of view, the Michelson interferometer with dihedrons appears to be much more interesting than the Sagnac interferometer. Indeed, calculation shows that, in the optimal symmetric configuration, and for the same beamsplitter diameter, the étendue accepted without vignetting by the Michelson interferometer is more than five times greater than the étendue accepted by the Sagnac interferometer. Even if, in a real instrument, the optical scheme cannot be exactly this optimal configuration, this result is a strong argument in support of the Michelson interferometer with dihedrons.

©(2006) Society of Photo-Optical Instrumentation Engineers (SPIE)

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Yann Ferrec, Jean Taboury, Herve Sauer, and Pierre H. Chavel "Optimal geometry for Sagnac and Michelson interferometers used as spectral imagers," Optical Engineering 45(11), 115601 (1 November 2006). https://doi.org/10.1117/1.2395923

Published: 1 November 2006

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