Degenerate four-wave interferences and perfect blaze
نویسنده
چکیده
We present a simple model for understanding the perfect blaze for diffraction with echelle gratings. Littrow diffraction at grating profiles with rectangular apexangles implicates two pairs of counterpropagating light waves. The four waves show a rectangular pattern of interference fringes. Integer numbers of such fringes along both facets of a groove ensure perfect blazing with echelle gratings.
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