Fabrication of toroidal and coma-corrected toroidal diffraction gratings from spherical master gratings using elastically deformable substrates: a progress report

Martin H.C. Huber; J. Gethyn Timothy; Jeffrey S. Morgan; Gerard R. Lemaitre; Giuseppe Tondello; Giampiero Naletto

doi:10.1117/12.46744

1 September 1991 Fabrication of toroidal and coma-corrected toroidal diffraction gratings from spherical master gratings using elastically deformable substrates: a progress report

Martin H.C. Huber, J. Gethyn Timothy, Jeffrey S. Morgan, Gerard R. Lemaitre, Giuseppe Tondello, Giampiero Naletto

Author Affiliations +

Proceedings Volume 1494, Space Astronomical Telescopes and Instruments; (1991) https://doi.org/10.1117/12.46744
Event: Orlando '91, 1991, Orlando, FL, United States

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.

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Martin H.C. Huber, J. Gethyn Timothy, Jeffrey S. Morgan, Gerard R. Lemaitre, Giuseppe Tondello, and Giampiero Naletto "Fabrication of toroidal and coma-corrected toroidal diffraction gratings from spherical master gratings using elastically deformable substrates: a progress report", Proc. SPIE 1494, Space Astronomical Telescopes and Instruments, (1 September 1991); https://doi.org/10.1117/12.46744

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