Geometrical invariance property of gratings

Details Geometrical invariance property of gratings Geometrical invariance property of gratings

Jan 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apopt..24..215m&link_type=abstract

Applied Optics (ISSN 0003-6935), vol. 24, Jan. 15, 1985, p. 215, 216.

Physics

Optics

2

Fermat Principle, Geometrical Optics, Gratings (Spectra), Invariance, Wave Diffraction, Grooves, Mounting, Surface Geometry

Scientific paper

In conical diffraction mountings, the direction of a given order diffracted by a grating when the grating is rotated about a suitable direction is shown to be invariant. This invariance property is very general and is characteristic of any groove shape, any diffracted order (positive or negative), and any mounting; it even applies to crossed gratings. A general geometrical explanation of this result in terms of Fermat's principle is presented which is valid for any reflecting surface.

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