GFP-IFS: a coronagraphic integral field spectrograph for the APO 3.5-meter telescope

David G. Bonfield; Bruce E. Woodgate; Carol A. Grady; George M. Hilton; Larry A White; Jacqueline E McCleary

doi:10.1117/12.789558

9 July 2008 GFP-IFS: a coronagraphic integral field spectrograph for the APO 3.5-meter telescope

David G. Bonfield, Bruce E. Woodgate, Carol A. Grady, George M. Hilton, Larry A White, Jacqueline E McCleary

Proceedings Volume 7014, Ground-based and Airborne Instrumentation for Astronomy II; 70146W (2008) https://doi.org/10.1117/12.789558
Event: SPIE Astronomical Telescopes + Instrumentation, 2008, Marseille, France

Abstract

We present the design and initial laboratory tests of a new integral-field spectroscopy mode to be added to the Goddard Fabry-Perot instrument at Apache Point Observatory. This new IFS mode incorporates a 'TIGER'-style lenslet array, with pre-optics to allow spatial sampling of 0.21 or 0.42 arcseconds, corresponding to fields-of-view of 7 or 14 arcseconds. For coronography, we insert a mask close to the lenslet array focal plane, blocking a discrete number of the lenslet foci. Three VPH grisms will be available to disperse the spectra, with medium-resolution (R~1000) red (λ ~ 660nm) and green (λ ~ 490nm) modes and a high-resolution (R~5000) red mode. We show that it is possible to reduce crosstalk between spectra by at least an order of magnitude by placing a pinhole mask at the focus of the lenslet array, and present data on the throughput of the lenslets and VPH grism.

Citation Download Citation

David G. Bonfield, Bruce E. Woodgate, Carol A. Grady, George M. Hilton, Larry A White, and Jacqueline E McCleary "GFP-IFS: a coronagraphic integral field spectrograph for the APO 3.5-meter telescope", Proc. SPIE 7014, Ground-based and Airborne Instrumentation for Astronomy II, 70146W (9 July 2008); https://doi.org/10.1117/12.789558

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