12 December 1984 Angular Grating Anomalies: An Apparent Violation Of The Grating Equation
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Diffraction gratings are known to exhibit anomalous behavior at certain critical wavelengths or incident angles. Previously reported anomalies manifest themselves as abrupt variations in diffracted order efficiency or grating absorption while their angular position remains unchanged as predicted by the grating equation. This paper reports experimental observations indicating a diffraction grating anomaly in the angular position of certain diffracted orders, which appears to violate the grating equation. Efforts to trace this behavior to experimental error failed and physical causes were sought. Experimental data for several grating profiles and measurement geometries are presented and compared to the results of an analysis of the effect of finite beam size upon the centroid location of diffraction grating orders.
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Elizabeth A. Nevis, Elizabeth A. Nevis, James E. Harvey, James E. Harvey, "Angular Grating Anomalies: An Apparent Violation Of The Grating Equation", Proc. SPIE 0503, Application, Theory, and Fabrication of Periodic Structures, DiffractionGratings, and Moire Phenomena II, (12 December 1984); doi: 10.1117/12.944812; https://doi.org/10.1117/12.944812

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