Abstract

We show that diffraction gratings can be naturally placed in the framework of geometrical optics. In this context, the relationship between path length and group delay, τ(ω) = l(ω)/c, is a straightforward result of Fermat’s principle. This result eases some of the conceptual difficulties involved in the analysis of grating-pair pulse compressors. Our method is equally applicable to both phase and amplitude gratings.

© 1988 Optical Society of America

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