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Proceedings Paper

Fabrication of toroidal and coma-corrected toroidal diffraction gratings from spherical master gratings using elastically deformable substrates: a progress report
Author(s): Martin H.C. Huber; J. Gethyn Timothy; Jeffrey S. Morgan; Gerard R. Lemaitre; Giuseppe Tondello; Giampiero Naletto
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Paper Abstract

A technique has been developed which permits toroidal, and coma-corrected toroidal, diffraction gratings to be replicated from spherical master gratings by the use of elastically-deformable substrates. Toroidal gratings correct for astigmatism and, thus, make it possible to construct stigmatic spectrometers that employ a single reflective diffraction grating. These spectrometers are particularly useful for the extreme-ultraviolet (EUV) wavelength range, where reflection coefficients are low, since the single optical surface provides for dispersion, focusing, and astigmatism correction. The fabrication procedures for the pure toroidal, and coma-corrected toroidal, gratings are described, and initial test results are presented. The use of the toroidal gratings in a high-resolution sounding-rocket EUV spectroheliometer, and in both the coronal diagnostics spectrometer and the ultraviolet coronagraph spectrometer on the ESA/NASA solar and heliospheric observatory mission, is described briefly, and the use of this technique for the fabrication of a coma-corrected toroidal grating for the prime Rowland spectrograph of the FUSE/Lyman mission is briefly discussed.

Paper Details

Date Published: 1 September 1991
PDF: 9 pages
Proc. SPIE 1494, Space Astronomical Telescopes and Instruments, (1 September 1991); doi: 10.1117/12.46744
Show Author Affiliations
Martin H.C. Huber, ESTEC (Netherlands)
J. Gethyn Timothy, Stanford Univ. (United States)
Jeffrey S. Morgan, Stanford Univ. (United States)
Gerard R. Lemaitre, Observatoire de Marseille (France)
Giuseppe Tondello, Univ. di Padova (Italy)
Giampiero Naletto, Univ. di Padova (Italy)

Published in SPIE Proceedings Vol. 1494:
Space Astronomical Telescopes and Instruments
Pierre Y. Bely; James B. Breckinridge, Editor(s)

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