Abstract

The validity of the Talbot effect is discussed on the basis of a rigorous analytical expression for the diffracted intensity by a one-dimensional Ronchi grid. Differences from the conventional treatment using the Fresnel approximation arise for small values of the ratio p/λ, where p is the period of the grid and λ the wavelength. For values of p/λ < 20 these differences become significant.

© 1991 Optical Society of America

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