A 30-cm objective grating for far-UV astronomy - Theoretical study and laboratory tests

Astronomy and Astrophysics – Astronomy

Scientific paper

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Calibrating, Far Ultraviolet Radiation, Gratings (Spectra), Ultraviolet Astronomy, Ultraviolet Spectroscopy, Aberration, Astigmatism, Collimators, Light Scattering, Point Sources, Spectral Sensitivity

Scientific paper

The theoretical study and experimental calibration of an objective grating for the high-resolution spectroscopy of astronomical faint sources in the EUV and far-UV wavelength ranges are discussed. Theoretical results demonstrate the feasibility of the concept, which involves an aspheric shape for the grating blank. Test results for a prototype grating associated with a photon counting detector show that a resolving power of 3 x 10 to the 4th, a total equivalent effective area of about 5-10 sq cm, and a very low scattered light level can be achieved.

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