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Proceedings Paper

CFHT f/4 coude echelle spectrograph, 316-g/mm 30-cm mosaic grating
Author(s): Walter A. Grundmann; F. Allen Moore; Eric Harvey Richardson
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Paper Abstract

The optical design of an f/4 coude echelle spectrograph for the 3.6-m Canada-France-Hawaii Telescope is described and illustrated with drawings and diagrams. The basic configuration comprises a tilted spherical f/20 collimator mirror, a 30-cm 316-g/mm grating near the slit, a paraboloid camera mirror, and a small triplet corrector lens. Two sets of optics are provided, coated for optimal performance in the UV-blue and green-IR regions, respectively, and small remotely selectable variable-wedge grism or grens modules are located in the diverging beam from the slit to the collimator to prevent other orders from overlapping the part of the spectrum being recorded. Consideration is given to the Hartmann mask system, the mosaic grating controls, the collimator and camera mirror turrets, and the detector support.

Paper Details

Date Published: 1 July 1990
PDF: 10 pages
Proc. SPIE 1235, Instrumentation in Astronomy VII, (1 July 1990); doi: 10.1117/12.19120
Show Author Affiliations
Walter A. Grundmann, Dominion Astrophysical Observatory (Canada)
F. Allen Moore, Dominion Astrophysical Observatory (Canada)
Eric Harvey Richardson, Dominion Astrophysical Observatory (Canada)

Published in SPIE Proceedings Vol. 1235:
Instrumentation in Astronomy VII
David L. Crawford, Editor(s)

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