Diffraction limitations of high-resolution spectrometers coupled to a Wolter telescope

Details Diffraction limitations of high-resolution spectrometers coupled to a Wolter telescope Diffraction limitations of high-resolution spectrometers coupled to a Wolter telescope

Sep 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apopt..24.2872m&link_type=abstract

Applied Optics (ISSN 0003-6935), vol. 24, Sept. 15, 1985, p. 2872, 2873.

Physics

Optics

2

Diffraction Patterns, Spectral Resolution, Ultraviolet Spectrometers, Ultraviolet Telescopes, Extreme Ultraviolet Radiation, Geometrical Optics, Grazing Incidence Telescopes, High Resolution

Scientific paper

When a high-resolution spectrometer is coupled to a grazing-incidence telescope of the Wolter type, a hollow cone of radiation is produced which illuminates an approximately elliptical annulus on the grating. Thus the grating lines are not uniformly illuminated, and interference among the waves leaving the grating surface may markedly degrade spectrometer performance. Here, the case of a plane grating, illuminated by a uniform parallel beam whose center has been masked off, is considered to gain a qualitative understanding of this problem. It is shown that one of the important goals of high-resolution spectroscopy, the resolution of spectral features and determination of their shape, can be defeated by nonuniform illumination of the grating surface, and, therefore, thin annular beams are to be avoided.

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