Abstract

We have performed theoretical determination and experimental calibrations of an objective grating designed for high resolution spectroscopy of astronomical faint sources in the EUV and far-UV wavelength ranges (500–1400 Å). First through theoretical calculations we show the feasibility of the concept with an aspheric shape for the grating blank and determine its geometrical parameters. A grating of this large size has been manufactured and tested, associated with a photon counting detector, in a vacuum environment. Finally we demonstrate that a resolving power of 3 × 104, a total equivalent effective area of ~5–10 cm2 can be achieved, together with a very low scattered light level (10−4–10−5 of the peak value).

© 1989 Optical Society of America

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