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Unconventional treatment of focal shift
Auteur(s)
Vokinger, Urs
Blattner, Peter
Date de parution
1998
In
Optics Communications, Elsevier, 1998/157/1-6/218-224
Résumé
We present an unconventional approach for the explanation of focal shift behind a lens. It is based on the fact that, within the approximation of Fresnel diffraction, the intensity distributions in the conjugate planes of a lens are equal to their geometrical images. We show that the focus (position of highest intensity) is always shifted towards the lens. The results for a Gaussian beam and a uniform converging spherical wave are presented.
Identifiants
Type de publication
journal article
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