Title

Tolerance On Defocus Precisely Locates The Far Field (Exactly Where Is That Far Field Anyway?)

Abstract

The Fraunhofer criterion defines the location of the boundary between the Fresnel and the Fraunhofer diffraction regions and thus determines the location of that region commonly referred to as the far field. The Fraunhofer criterion is usually given as an axial distance much greater than some amount relative to the maximum dimension of the aperture. By recognizing that Fresnel diffraction patterns are merely defocused Fraunhofer diffraction patterns, we show that the Fraunhofer criterion can be written precisely in terms of an allowable tolerance on defocus. This new criterion provides insight that is useful to optical designers and engineers who routinely deal with such tolerances. © 2002 Optical Society of America.

Publication Date

5-1-2002

Publication Title

Applied Optics

Volume

41

Issue

13

Number of Pages

2586-2588

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1364/AO.41.002586

Socpus ID

0036575167 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/0036575167

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