Properties of a transmission grating behind a grazing incidence telescope for cosmic X-ray spectroscopy

Details Properties of a transmission grating behind a grazing incidence telescope for cosmic X-ray spectroscopy Properties of a transmission grating behind a grazing incidence telescope for cosmic X-ray spectroscopy

May 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977apopt..16.1425b&link_type=abstract

Applied Optics, vol. 16, May 1977, p. 1425-1431.

Physics

Optics

10

Cosmic X Rays, Gratings (Spectra), Grazing, Grazing Incidence Telescopes, Spectral Resolution, X Ray Spectroscopy, X Ray Telescopes, Aberration, Crystals, High Resolution, Systems Engineering

Scientific paper

Properties of an X-ray transmission grating intended as a dispersive device for a grazing-incidence imaging telescope are discussed. The grating is produced by a mechanical ruling process in order to obtain a systematically varying period, which is desirable if the grating is to be employed as a coma-free device in the light path behind a Wolter telescope. Third-order grating aberrations are examined on the basis of Fermat's principle, and the spectral resolution of the grating-mirror-detector system is evaluated along with the performance of a complete system designed for cosmic X-ray studies. It is shown that the performance of a coma-corrected grating behind the telescope is superior to that of a constant-period grating in front of the telescope, that the corrected grating offers a significant advantage over an uncorrected grating at intermediate wavelengths, and that grating spectroscopy can achieve a resolution close to that of moderate-resolution crystal spectroscopy.

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