Wadsworth mount redux: paraboloidal versus spherical gratings

Details Wadsworth mount redux: paraboloidal versus spherical gratings Wadsworth mount redux: paraboloidal versus spherical gratings

Nov 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003apopt..42.6245h&link_type=abstract

Applied Optics, Volume 42, Issue 31, pp. 6245-6254 (2003).

Physics

Optics

1

Diffraction Gratings, Ultraviolet Spectrometers, Astronomical Telescopes, Ray Tracing, Aberrations, Spectral Analysis

Scientific paper

Spherical and paraboloidal diffraction gratings are considered for use on an experiment involving a collection of satelliteborne spectrographs that will investigate astrophysical plasmas in the spectral region from approximately 100 to 300 Å. We shall use eight spectrographs: Wadsworth mounts in near-normal incidence with effective focal lengths of 3 m, each centered on a chosen wavelength in this spectral range. Ray tracings show that paraboloidal gratings used in the Wadsworth mount have a significant increase in resolution over spherical gratings of the same effective focal length, used in the same mounting, as long as the spectral ranges are small (approximately 10% of the central wavelength). This increase in resolution is due to the spatial extent of coma for a paraboloidal grating that is less than the circle of least confusion of spherical gratings.

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