Far ultraviolet scatter performance from holographic gratings

Matthew Beasley; Brennan Gantner; James Green

doi:10.1117/12.789541

15 July 2008 Far ultraviolet scatter performance from holographic gratings

Matthew Beasley, Brennan Gantner, James Green

Proceedings Volume 7011, Space Telescopes and Instrumentation 2008: Ultraviolet to Gamma Ray; 70113O (2008) https://doi.org/10.1117/12.789541
Event: SPIE Astronomical Telescopes + Instrumentation, 2008, Marseille, France

Abstract

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.

Citation Download Citation

Matthew Beasley, Brennan Gantner, and James Green "Far ultraviolet scatter performance from holographic gratings", Proc. SPIE 7011, Space Telescopes and Instrumentation 2008: Ultraviolet to Gamma Ray, 70113O (15 July 2008); https://doi.org/10.1117/12.789541

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