Physics – Optics
Scientific paper
Oct 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982spie..331..252r&link_type=abstract
IN: Instrumentation in astronomy IV; Proceedings of the Fourth Conference, Tucson, AZ, March 8-10, 1982 (A83-31976 14-35). Belli
Physics
Optics
Gratings (Spectra), Lenses, Optical Correction Procedure, Spectral Resolution, Telescopes, Cassegrain Optics, Coma, Paraboloid Mirrors, Prisms
Scientific paper
Hoag and Schroeder (1970) used a transmission grating in the converging beam of a telescope to do low dispersion, multiobject, slitless spectroscopy. Bowen and Vaughan (1973) added a wedge or prism to the grating, thus a 'grism' so that the coma produced by the grating was balanced by that of the weak prism. A grism is used at the prime focus of the Kitt Peak National Observatory (KPNO) 4 m Ritchey-Chretien (R-C) telescope. At the Canada France Hawaii Telescope (CFHT) the coma compensation is achieved by wedging the third and last element of the Wynne corrector reoptimized by Richardson to have a flat last surface. The system has three, interchangeable final lens elements, two with gratings on them, i.e., 'grenses'. It is found that for wide field slitless spectroscopy at the prime focus of large telescopes, the grens is superior to the grism. If another corrector were built for the KPNO telescope with a flat final surface for use as a grens, the performance could be improved.
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