Concentric spectrographs

Details Concentric spectrographs Concentric spectrographs

Dec 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977apopt..16.3122m&link_type=abstract

Applied Optics, vol. 16, Dec. 1977, p. 3122-3124. Research supported by the Smithsonian Research Foundation.

Physics

Optics

3

Gratings (Spectra), Holographic Interferometry, Image Resolution, Spectroscopy, Apertures, Cassegrain Optics, Concentricity, Ray Tracing, Schmidt Telescopes, Surface Geometry

Scientific paper

Diffraction grating grooves have been applied to the concave reflecting surfaces of spectrographs. The advantages of this concentric configuration include sharp imagery, a high numerical aperture, a wide, flat, unvignetted field, a readily accessible, nonamorphic field, absence of pupil obscuration, and absence of required aspherical optical surfaces. Among its disadvantages are that the spectrograph is limited to low dispersion, that it requires transmitting material, that its focal ratio does not directly match that of telescopes, and that its diffraction grating must be holographically formed. Testing of a prototype has yielded excellent image quality at high numerical aperture.

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