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Acousto-optic imaging spectropolarimetry for remote sensing

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Abstract

We review the operating principles of noncollinear acousto-optic tunable filters (AOTF’s), emphasizing use of two orthogonally polarized beams for narrow-band imaging. Spectral characterization and the spectral broadening measurements of commercially available AOTF’s agree with theoretical predictions and reveal difficulties associated with imaging noncollimated light. An AOTF imaging spectropolarimeter for ground-based astronomy that uses CCD’s has been constructed at NASA Goddard Space Flight Center. It uses a TeO2 noncollinear AOTF and a simple optical relay assembly to produce side-by-side orthogonally polarized spectral images. We summarize the instrument design and initial performance tests. We include sample spectral images acquired at the Goddard Geophysical and Astronomical Observatory.

© 1994 Optical Society of America

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