Some features of the Canada-France-Hawaii telescope. I - Before-foci optical design

Details Some features of the Canada-France-Hawaii telescope. I - Before-foci optical design Some features of the Canada-France-Hawaii telescope. I - Before-foci optical design

Sep 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979cajph..57.1365r&link_type=abstract

Canadian Journal of Physics, vol. 57, Sept. 1979, p. 1365-1369.

Physics

1

Foci, Optical Correction Procedure, Systems Engineering, Telescopes, Calcium Fluorides, Computer Programs, Focusing, Lenses, Tables (Data)

Scientific paper

The 3.6-m Canada-France-Hawaii telescope has such unusual before-focus optical features as (1) a three-element prime focus corrector lens which can have a transmission grating on the last element, giving a dispersion of 1000 A/mm over a 1-deg field at F/4.2, and (2) a small-mirror coude train, triplicated for high-reflectance coatings, which can be adjusted to produce a small, 15 mm, collimated beam suitable for insertion of a polarization modulator before the declination axis. The principal optical components are described and a schematic of transfer optics is provided.

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