We describe a thin-film spectrograph for guided optical or surface acoustic waves which involves wave diffraction from a concentric-arc grating in a slab waveguide. In this spectrograph, diffracted waves in the waveguide form spectra of various orders which are in focus on a circle similar to the Rowland circle of an ordinary grating spectrograph. The optics described above may also be used for acousto-optic deflection, integrated optic spectrum analyzers, and other applications.
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Tien et al. (1980) studied this question.