Wide-field collimators for spectrographs

Details Wide-field collimators for spectrographs Wide-field collimators for spectrographs

Jan 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991mnras.248..328w&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 248, Jan. 15, 1991, p. 328-331.

Physics

Optics

Astronomical Spectroscopy, Collimators, Spectrographs, Cassegrain Optics, Mirrors

Scientific paper

This paper discusses various possibilities of collimators for wide-field fiber-fed spectroscopy, that would have good correction of oblique aberration. These possible collimators include a single mirror with some form of field correction (e.g., of Schmidt or Maksutov type), a two-mirror system of Cassegrain type, purely lenticular collimators, and collimators of the Maksutov form. It is shown that an off-axis Maksutov collimator is the best type for multifiber-fed wide field spectroscopy. Such a collimator can provide a highly corrected and obstruction-free alternative to the traditional off-axis paraboloid mirrors which are only suitable for spectroscopy of small objects. Optical data are presented of an f/11 and an f/6.5 off-axis Maksutov collimators.

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