Abstract
The diffraction of a slowly varying input beam incident upon a nonuniform grating is studied. Expressions for the diffracted field at the output of the grating are first derived relying on well known kinematic and coupled wave theories. A third approach based on Fourier expansions of both the input beam and the quasi-periodic grating is then introduced and shown to provide the same expression under certain simplifying assumptions. The advantages of the approach for the solution of more general problems are discussed.
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Lewis, J.W., Solymar, L. Low efficiency diffraction by nonuniform phase gratings: a comparison of three approaches. Opt Quant Electron 15, 297–303 (1983). https://doi.org/10.1007/BF00619899
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DOI: https://doi.org/10.1007/BF00619899