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Opt Lett. 2004 Apr 1;29(7):661-3.

Generating an adjustable three-dimensional dark focus.

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1
Harvard Medical School and the Wellman Center for Photomedicine, Massachusetts General Hospital, 55 Fruit Street, BAR 703, Boston, Massachusetts 02114, USA. dyelin@partners.org

Abstract

Conditions for generating a dark focus surrounded by light in all three dimensions are presented. A simple technique for generating such a dark region is demonstrated experimentally. The method is compared with previous attempts at creating a three-dimensional dark focus.

PMID:
15072350
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