The author is with the Laboratoire d’Astronomie Spatiale du Centre National de la Recherche Scientifique, Traverse du Siphon, Les Trois Lues, 13012 Marseille, France.
Various grating designs have been proposed by several investigators for possible use with the Lyman/Far-Ultraviolet Spectroscopic Explorer mission. The image quality, the feasibility, and the efficiency of five designs are compared, each using a distinct type of grating: (1) a grating ruled on a deformed ellipsoidal or toroidal blank, (2) an ellipsoidal grating recorded holographically with two auxiliary spherical mirrors, (3) a spherical holographic grating recorded with two auxiliary spherical holographic gratings, (4) a spherical ruled grating with variable spacing and straight grooves, and (5) a spherical ruled grating with a groove pattern that is determined theoretically (hybrid grating). From a purely theoretical viewpoint, grating (5) provides the finest images, followed by gratings, (3), (1), (4), and (2). In view of the current technological limitations, the order of practical importance is gratings (4), (1), (2), (3), and (5).
You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.
You do not have subscription access to this journal. Figure files are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.
You do not have subscription access to this journal. Article tables are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.
You do not have subscription access to this journal. Equations are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.
Normalized aberrations produced upon C: −280, −400, 101.8. Elliptic ruled area: 216 m × 250 mm.
Normalized abberations produced upon D: 243.73, −309.48, 60.43. Elliptic ruled area: 270 mm × 275 mm.
Normalized aberrations produced upon C: −280, −400, 101.8. Elliptic ruled area: 216 m × 250 mm.
Normalized abberations produced upon D: 243.73, −309.48, 60.43. Elliptic ruled area: 270 mm × 275 mm.