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Proceedings Paper

Binospec: a dual-beam wide-field optical spectrograph for the converted MMT
Author(s): Daniel G. Fabricant; Robert G. Fata; Harland W. Epps
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Paper Abstract

Binospec is a wide-field, multi-object optical spectrograph to be used at the f/5 focus of the converted 6.5 m Multiple Mirror Telescope. Its dual beams will address adjacent 8' X 15' fields of view, yielding a total slit length of 30'. Binospec will offer approximately 1 - 6 Angstrom resolution at wavelengths between 0.39 and 1.0 micrometer with a 200 mm collimated beam diameter. Although it is difficult to design an f/5 wide-field collimator, f/5 optics are compact, allowing a small and stiff instrument structure. Binospec uses refractive optics throughout; the collimator contains three lens groups and the camera contains four lens groups. Three aspheric surfaces are used: two in the collimator and one in the camera. A pair of 2048 by 4608 pixel CCD detectors are used for each beam, yielding a sampling of 0.22' per pixel. Binospec's innovative optical design allows excellent image quality. Including the contribution of the MMT optics with the f/5 wide-field corrector, the RMS image diameter at Binospec's focal plane is 18 micrometer (1.3 pixels) averaged over field angles and colors.

Paper Details

Date Published: 9 July 1998
PDF: 10 pages
Proc. SPIE 3355, Optical Astronomical Instrumentation, (9 July 1998); doi: 10.1117/12.316765
Show Author Affiliations
Daniel G. Fabricant, Harvard-Smithsonian Ctr. for Astrophysics (United States)
Robert G. Fata, Harvard-Smithsonian Ctr. for Astrophysics (United States)
Harland W. Epps, Univ. of California/Santa Cruz (United States)


Published in SPIE Proceedings Vol. 3355:
Optical Astronomical Instrumentation
Sandro D'Odorico, Editor(s)

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