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24 September 1998 6000-g/mm holographic flight gratings for the high-resolution Far Ultraviolet Spectroscopic Explorer: efficiency, resolution, and stray light measurements
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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.
© (1998) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Robert Grange, Veronique Dauer, Michel Saisse, Michel Neviere, Jean Flamand, and Francis Bonnemason "6000-g/mm holographic flight gratings for the high-resolution Far Ultraviolet Spectroscopic Explorer: efficiency, resolution, and stray light measurements", Proc. SPIE 3450, Theory and Practice of Surface-Relief Diffraction Gratings: Synchrotron and Other Applications, (24 September 1998); https://doi.org/10.1117/12.323405
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