Abstract

A theoretical analysis has been made of a diffraction grating defect in which the ruled lines are fanned out uniformly and appear to intersect at a common point in space. The resulting phenomenon, a tilting of the spectral image, is formulated and experimentally verified. The theory further predicts a loss of resolving power under certain conditions, and it is suggested that this may be the cause of heretofore inexplicable losses in resolving power for otherwise perfect gratings.

© 1955 Optical Society of America

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