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Nonclassical Concave Grating Imaging

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Nonclassical Concave Grating Imaging

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For nonclassical groove patterns, the aberration coefficients Fij must be generalized to account for the image-modifying effects of the variations in curvature and spacing of the grooves, as well as for the focusing effects of the concave substrate. Nonclassical concave gratings are generally produced holographically, but for certain applications, they can be made by mechanical ruling as well, by changing the groove spacing from one groove to the next during ruling, by curving the grooves, or both. For such varied line-space (VLS) gratings, the terms Hij are written in terms of the groove spacing coefficients rather than in terms of recording coordinates.

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