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Proceedings Paper

Efficiency calibration of the four multilayer-coated holographic ion-etched flight gratings for a sounding rocket high-resolution spectrometer
Author(s): Michael P. Kowalski; Herbert Gursky; Jack C. Rife; Daryl J. Yentis; Raymond G. Cruddace; Troy W. Barbee; William H. Goldstein; Joseph F. Kordas; Klaus F. Heidemann; Gilbert G. Fritz; William R. Hunter; Martin Adrian Barstow; George W. Fraser; Nigel P. Bannister; Jonathan S. Lapington; J. A. Tandy; B. S. Sanderson
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Paper Abstract

We have fabricated the four flight gratings for a sounding rocket high-resolution spectrometer using a holographic ion-etching technique. The gratings are spherical (4000-mm radius of curvature), large (160 mm x 90 mm), and have a laminar groove profile of high density (3600 grooves/mm). They have been coated with a high-reflectance multilayer of Mo5C/Si/Mo2Si. Using an atomic force microscope, we examined the surface characteristics before and after multilayer coating. The average roughness is approximately 2-3A rms after coating, somewhat smoothened by the multilayer. Using synchrotron radiation, we completed an efficiency calibration map of each grating over the wavelength range 225-245A. At an angle of incidence of 5 degree(s) and a wavelength of 234A, the average efficiency peaks in the first inside order at 10.3+/- 0.6% for Grating 1, 7.3+/- 0.9% for Grating 6, 7.2+/- 1.2% for Grating 3, and 9.0+/- 1.5% for Grating 4. These values exceed all previously published results for a high density grating. The first order groove efficiency for Grating 1 is 34.4+/- 1.9%, in good agreement with the best value obtained from similar test gratings and close to the theoretical limit of 40.5%.

Paper Details

Date Published: 10 December 2001
PDF: 12 pages
Proc. SPIE 4498, UV/EUV and Visible Space Instrumentation for Astronomy and Solar Physics, (10 December 2001); doi: 10.1117/12.450065
Show Author Affiliations
Michael P. Kowalski, Naval Research Lab. (United States)
Herbert Gursky, Naval Research Lab. (United States)
Jack C. Rife, Naval Research Lab. (United States)
Daryl J. Yentis, Naval Research Lab. (United States)
Raymond G. Cruddace, Naval Research Lab. (United States)
Troy W. Barbee, Lawrence Livermore National Lab. (United States)
William H. Goldstein, Lawrence Livermore National Lab. (United States)
Joseph F. Kordas, Lawrence Livermore National Lab. (United States)
Klaus F. Heidemann, Carl Zeiss (Germany)
Gilbert G. Fritz, PRAXIS Inc. (United States)
William R. Hunter, SFA, Inc. (United States)
Martin Adrian Barstow, Univ. of Leicester (United Kingdom)
George W. Fraser, Univ. of Leicester (United Kingdom)
Nigel P. Bannister, Univ. of Leicester (United Kingdom)
Jonathan S. Lapington, Mullard Space Science Lab. (United States)
J. A. Tandy, Mullard Space Science Lab. (United Kingdom)
B. S. Sanderson, Mullard Space Science Lab. (United Kingdom)


Published in SPIE Proceedings Vol. 4498:
UV/EUV and Visible Space Instrumentation for Astronomy and Solar Physics
Oswald H. W. Siegmund; Silvano Fineschi; Mark A. Gummin, Editor(s)

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