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Applied Optics

Applied Optics


  • Vol. 32, Iss. 25 — Sep. 1, 1993
  • pp: 4881–4889

Deformed ellipsoidal gratings for far-ultraviolet spectrographs: analytic optimization

David Content and Takeshi Namioka  »View Author Affiliations

Applied Optics, Vol. 32, Issue 25, pp. 4881-4889 (1993)

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Analytic formulas are developed for the semiaxes and for the deformation coefficients of a deformed ellipsoidal grating that minimize aberrations over a given spectral range. These include the Rowland circle mount and quasi-Rowland circle mounts, as required for systems that combine spectra from multiple gratings on a common detector. It is also shown that the necessary condition for a holographic grating to give a better performance over a conventional grating is the use of a convergent beam and a divergent beam for the recording. Examples applicable to the Far-Ultraviolet Spectroscopic Explorer are given. The light-path function for a deformed ellipsoidal holographic grating is also presented.

© 1993 Optical Society of America

Original Manuscript: May 28, 1992
Published: September 1, 1993

David Content and Takeshi Namioka, "Deformed ellipsoidal gratings for far-ultraviolet spectrographs: analytic optimization," Appl. Opt. 32, 4881-4889 (1993)

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  17. It is assumed here that the imaging of the FUSE telescope will not be drastically better than the current 1-arcsec specification; if it were, the spectral resolving power of the system would improve correspondingly.

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