Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008spie.7011e.108b&link_type=abstract
Space Telescopes and Instrumentation 2008: Ultraviolet to Gamma Ray. Edited by Turner, Martin J. L.; Flanagan, Kathryn A. Pr
Astronomy and Astrophysics
Astrophysics
1
Scientific paper
We present deep scatter measurements on a sinusoidal profile, high groove density, holographically ruled, large format grating. With long exposures and a low-noise detector, we were able to measure scatter at levels of 1 * 10-6/Ly α/nm at 100 nm. The result has potential impacts in the prospect of high sensitivity measurements of very faint objects at FUV wavelengths. Any instrument sensitive to hydrogen Lyman α, a bright geo-coronal airglow line, must control the scatter to make astrophysically significant measurements. Measurements of very faint emission line source - particularly ones that do not have known redshifts (i.e. wavelength solution), Lyman α scatter may be the dominant source of error. Therefore, characterization of the actual value of scatter is crucial to the success of future missions that will use diffraction-based measures for detecting very faint targets.
Beasley Matthew
Gantner Brennan
Green Jeremy
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