Focusing in a largeF-number optical system

Autor:	M. A. Gusinow, M. A. Palmer, M. E. Riley
Rok vydání:	1977
Předmět:	Physics Diffraction Beam diameter Geometrical optics business.industry Aperture Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials Optics Thin lens Electrical and Electronic Engineering business Focus (optics) Intensity (heat transfer) Gaussian beam
Zdroj:	Optical and Quantum Electronics. 9:465-471
ISSN:	1572-817X 0306-8919
DOI:	10.1007/bf01208756
Popis:	The true focal spot of a focusing system may be defined as either the location of the maximum on-axis intensity or the location of the minimum beam diameter that contains a certain fraction of the power. Diffraction causes this true focus to be shifted from the ideal geometrical optics prediction, the effect being greatest at largeF-numbers. Specifically, a theoretical and experimental study is made of the largeF-number focusing properties of a thin lens in contact with a uniformly illuminated aperture. The results are clarified by a comparison to the focal spot shift for a Gaussian beam.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::e77cb9ef7f3a7353ca47ffcd02ebc884 https://doi.org/10.1007/bf01208756 Zobrazit plný text záznamu Full text from SpringerLink