POLARIS-II: an acousto-optic imaging spectropolarimeter for ground-based astronomy

David Alan Glenar; J. J. Hillman; Babak N. Saif; J. Bergstrahl

doi:10.1117/12.138833

8 December 1992 POLARIS-II: an acousto-optic imaging spectropolarimeter for ground-based astronomy

David Alan Glenar, J. J. Hillman, Babak N. Saif, J. Bergstrahl

Proceedings Volume 1747, Polarization and Remote Sensing; (1992) https://doi.org/10.1117/12.138833
Event: San Diego '92, 1992, San Diego, CA, United States

Abstract

A compact, acousto-optic tunable filter (AOTF) imaging spectropolarimeter for ground based astronomy from 400-1100 nm has been constructed at NASA/GSFC. The key components of this instrument are a TeO₂ non-collinear AOTF, CCD camera, and an all-reflective optical relay assembly which uses a single elliptical mirror to produce side-by-side orthogonally polarized spectral images. The instrument was used at the Lowell Observatory 42-inch telescope for 'first light' planetary imaging and measurements of photometric standard stars. Narrow-band images of Saturn near 700 nm appear to show polarization effects which result from multiple scattering by aerosols. The instrument has recently been upgraded in order to integrate the RF drive electronics and eliminate contamination by scattered light. Design of the instrument and some initial results are presented.

Citation Download Citation

David Alan Glenar, J. J. Hillman, Babak N. Saif, and J. Bergstrahl "POLARIS-II: an acousto-optic imaging spectropolarimeter for ground-based astronomy", Proc. SPIE 1747, Polarization and Remote Sensing, (8 December 1992); https://doi.org/10.1117/12.138833

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