Aspheric grating for extreme ultraviolet astronomy

Details Aspheric grating for extreme ultraviolet astronomy Aspheric grating for extreme ultraviolet astronomy

Apr 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978apopt..17.1252k&link_type=abstract

Applied Optics, vol. 17, Apr. 15, 1978, p. 1252-1258.

Astronomy and Astrophysics

Astronomy

4

Diffraction, Far Ultraviolet Radiation, Gratings (Spectra), Stellar Radiation, Ultraviolet Astronomy, Incident Radiation, Point Sources, Stigmatism, Toroids

Scientific paper

A family of plane curves is developed which can diffract incident parallel rays to a point focus. These curves, termed diffractoidal curves, are rotated around an axis to produce surfaces of revolution correspondingly termed diffractoids, whose imaging properties for sources at infinity are studied by ray tracing in a few examples. The paraboloid emerges as a limiting case of the diffractoid. A comparison is made between the stigmatic focusing properties of the diffractoid and the toroidal grating.

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