A simple, high efficiency, high resolution spectropolarimeter

Samuel C. Barden

doi:10.1117/12.925240

24 September 2012 A simple, high efficiency, high resolution spectropolarimeter

Samuel C. Barden

Proceedings Volume 8446, Ground-based and Airborne Instrumentation for Astronomy IV; 844639 (2012) https://doi.org/10.1117/12.925240
Event: SPIE Astronomical Telescopes + Instrumentation, 2012, Amsterdam, Netherlands

Abstract

A simple concept is described that uses volume phase holographic gratings as polarizing dispersers for a high efficiency, high resolution spectropolarimeter. Although the idea has previously been mentioned in the literature as possible, such a concept has not been explored in detail. Performance analysis is presented for a VPHG spectropolarimeter concept that could be utilized for both solar and night-time astronomy. Instrumental peak efficiency can approach 100% with spectral dispersions permitting R~200,000 spectral resolution with diffraction limited telescopes. The instrument has 3-channels: two dispersed image planes with orthogonal polarization and an undispersed image plane. The concept has a range of versatility where it could be configured (with appropriate half-wave plates) for slit-fed spectroscopy or without slits for snapshot/hyperspectral/tomographic spectroscopic imaging. Multiplex gratings could also be used for the simultaneous recording of two separate spectral bands or multiple instruments could be daisy chained with beam splitters for further spectral coverage.

Citation Download Citation

Samuel C. Barden "A simple, high efficiency, high resolution spectropolarimeter", Proc. SPIE 8446, Ground-based and Airborne Instrumentation for Astronomy IV, 844639 (24 September 2012); https://doi.org/10.1117/12.925240

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