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Proceedings Paper

6000-g/mm holographic flight gratings for the high-resolution Far Ultraviolet Spectroscopic Explorer: efficiency, resolution, and stray light measurements
Author(s): Robert Grange; Veronique Dauer; Michel Saisse; Michel Neviere; Jean Flamand; Francis Bonnemason
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Paper Abstract

In the context of the NASA Far Ultraviolet Spectroscopic Explorer (FUSE) mission, the Laboratoire d'Astronomie Spatiale (LAS) has been in charge of designing and testing the six flight gratings of the spectrograph. The FUSE experiment is dedicated to the spectroscopic study of the 900 - 1200 angstroms range with a 100 cm2 equivalent surface and a resolution power of 30,000. These requirements yielded to especially challenging gratings with both very high groove density (6000 g/mm) and large size (300*300 mm2). The aberrations have been corrected using a new recording geometry proposed by LAS. After recalling this new recording setup, we will describe the optical performances (resolution, efficiency, stray light) of the six flight gratings manufactured by Jobin-Yvon company. In particular, we will show that the groove efficiency has reached a value of 38% at 1048 angstroms that is 80% of the theoretical value. Efficiency improvement is still possible using ion- etching technique to modify the groove profile.

Paper Details

Date Published: 24 September 1998
PDF: 10 pages
Proc. SPIE 3450, Theory and Practice of Surface-Relief Diffraction Gratings: Synchrotron and Other Applications, (24 September 1998); doi: 10.1117/12.323405
Show Author Affiliations
Robert Grange, Lab. d'Astronomie Spatiale/CNRS (France)
Veronique Dauer, Lab. d'Astronomie Spatiale/CNRS (France)
Michel Saisse, Lab. d'Astronomie Spatiale/CNRS (France)
Michel Neviere, Lab. d'Optique Electromagnetique (France)
Jean Flamand, Jobin-Yvon (France)
Francis Bonnemason, Jobin-Yvon (France)

Published in SPIE Proceedings Vol. 3450:
Theory and Practice of Surface-Relief Diffraction Gratings: Synchrotron and Other Applications
Wayne R. McKinney; Christopher A. Palmer, Editor(s)

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