6000 g/mm holographic ellipsoidal grating recorded with aberrated wavefronts: efficiency and resolution measurements in the far ultraviolet

Robert Grange; Sylvain Chambord; Michel Saisse; Jean Louis Reynaud; Jean Flamand; Michel Neviere

doi:10.1117/12.221241

22 September 1995 6000 g/mm holographic ellipsoidal grating recorded with aberrated wavefronts: efficiency and resolution measurements in the far ultraviolet

Robert Grange, Sylvain Chambord, Michel Saisse, Jean Louis Reynaud, Jean Flamand, Michel Neviere

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Proceedings Volume 2532, Application and Theory of Periodic Structures; (1995) https://doi.org/10.1117/12.221241
Event: SPIE's 1995 International Symposium on Optical Science, Engineering, and Instrumentation, 1995, San Diego, CA, United States

Abstract

The Far Ultraviolet Spectroscopic Explorer (FUSE) mission from NASA will explore the 900-1200 angstrom wavelength range with unequaled effective area and spectral resolving power (R equals 30,000). The optical solution relies on the single concave grating mount, which is the soundest design to keep a high throughput in the far UV, yet FUSE requires both groove efficiency and correction of aberrations to be pushed to their limits. A holographically corrected ellipsoidal prototype grating corresponding to the FUSE Phase A has been studied at Laboratoire d'Astronomie Spatiale (LAS) and recorded by Jobin-Yvon company. First, we show the results of the efficiency measurements compared with theoretical values and we discuss potential improvements allowed by ion etching process. Second, we present a spectrum of the molecular hydrogen recorded with a bidimensional delay line detector, and show that the 30,000 resolving power is reached for the most challenging channel (910-1030 angstrom) of the experiment.

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Robert Grange, Sylvain Chambord, Michel Saisse, Jean Louis Reynaud, Jean Flamand, and Michel Neviere "6000 g/mm holographic ellipsoidal grating recorded with aberrated wavefronts: efficiency and resolution measurements in the far ultraviolet", Proc. SPIE 2532, Application and Theory of Periodic Structures, (22 September 1995); https://doi.org/10.1117/12.221241

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KEYWORDS

Holography

Monochromatic aberrations

Spectral resolution

Sensors

Spectrographs

Wavefronts

Far ultraviolet

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