Unconventional treatment of focal shift

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...

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Veröffentlicht in:	Optics communications 1998-12, Vol.157 (1), p.218-224
Hauptverfasser:	Vokinger, Urs, Dändliker, René, Blattner, Peter, Herzig, Hans Peter
Format:	Artikel
Sprache:	eng
Schlagworte:	Exact sciences and technology Focal shift Fourier optics Fundamental areas of phenomenology (including applications) Geometrical optics Image forming and processing Imaging and optical processing Optics Physics Wave optics Wave propagation, transmission and absorption
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Beschreibung
Zusammenfassung:	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.
ISSN:	0030-4018 1873-0310
DOI:	10.1016/S0030-4018(98)00506-9