Numerical results for plane-wave scattering from a perfectly conducting diffraction grating with triangular groove profile show that simultaneous blazing with 100% efficiency in both polarizations is obtainable in a Littrow arrangement. The range of angles of incidence, for which such simultaneous blazing occurs, is considerably narrower than that obtainable with a rectangular groove profile.
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Cheo et al. (1977) studied this question.
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