Pupil Scrambling Integral Field Unit (PSI) for the Robert Stobie Spectrograph on SALT

Michael P. Smith; Marsha J. Wolf; Matthew A. Bershady; Guangwei Fu; Longji Bing

doi:10.1117/12.2233102

22 July 2016 Pupil Scrambling Integral Field Unit (PSI) for the Robert Stobie Spectrograph on SALT

Michael P. Smith, Marsha J. Wolf, Matthew A. Bershady, Guangwei Fu, Longji Bing

Proceedings Volume 9912, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation II; 99125B (2016) https://doi.org/10.1117/12.2233102
Event: SPIE Astronomical Telescopes + Instrumentation, 2016, Edinburgh, United Kingdom

Abstract

We propose to build an integral field unit (IFU) for the Robert Stobie Spectrograph (RSS) on the Southern African Large Telescope (SALT). This IFU (PSI) will employ the scrambling properties of fibers to address fundamental problems in achieving photon-limited sky subtraction due to variations in pupil illumination during observations. PSI will be fully encapsulated with a compact folding scheme in a standard long slit mask—far thinner than any previous fiber-based implementation. The IFU will cover 14 x 24 arcsec on sky, achieving spectral resolution R ≡ λ/δλ up to 6200 and photon-limited sky subtraction for studies of faint extended gas around galaxies beyond the reach of current 4m-class instruments. It will incorporate new-technology octagonal shaped fiber cores coupled by telecentric, pupil-imaging lenslets to fully optimize pupil scrambling and provide 100% integral sky coverage.

Citation Download Citation

Michael P. Smith, Marsha J. Wolf, Matthew A. Bershady, Guangwei Fu, and Longji Bing "Pupil Scrambling Integral Field Unit (PSI) for the Robert Stobie Spectrograph on SALT ", Proc. SPIE 9912, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation II, 99125B (22 July 2016); https://doi.org/10.1117/12.2233102

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