Abstract
An optical design for spherical-grating monochromators for
application to synchrotron radiation is presented. High spectral
and spatial performance is obtained with a spherical
variable-line-spaced grating coupled to a spherical mirror with its
tangential plane coincident with the grating’s equatorial
plane. The monochromator works without an entrance slit in an
off-Rowland configuration with a fixed entrance arm and demagnification
on the exit slit. The law for groove-space variation of the grating
compensates for the main spectral aberrations; spectral focusing in an
extended energy range is ensured by a slight change in the exit arm
with translations of the order of a few tens of millimeters. The
inclusion of a spherical mirror ensures focusing on a plane
perpendicular to the plane of spectral dispersion. The ultimate
resolution is limited by the slope errors of a single spherical
surface. The layout is applied to the design of a high-resolution
monochromator for the 1000–250-eV region.
© 2000 Optical Society of America
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