The reflection efficiency of a lightly ruled glass grating, mainly in relation to its short-wavelength limit in the soft x-ray region, is discussed on the basis of the Rayleigh–Fano theory, which deals with Wood’s anomalies of optical gratings. The reflectances of waves diffracted by a glass grating are calculated under appropriately assumed conditions and the locations of the abrupt enhancement of reflection are derived. Theoretical predictions have been confirmed by a simulated experiment performed in the visible region.
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Fujiwara et al. (1968) studied this question.
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