High-efficiency concave-grating monochromator with wavelength-independent focusing characteristics
- 1 August 1982
- journal article
- Published by Optica Publishing Group in Journal of the Optical Society of America
- Vol. 72 (8), 1056-1061
- https://doi.org/10.1364/josa.72.001056
Abstract
A cylindrical grating with tangential focusing provided by exponentially spaced grooves can be used by itself or in conjunction with an elliptical mirror to construct a monochromator that has better resolution over its entire tuning range than a toroidal-grating monochromator has at its optimum wavelength. In contrast to conventional Wadsworth or Rowland circle designs, a cylindrical-grating monochromator is always in focus, always on blaze with respect to the principal ray, has wavelength-independent resolution and focusing properties, and can be tuned over an order of magnitude with a simple linear motion.Keywords
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