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An objective lens for efficient fluorescence detection of single atoms

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We present the design of a diffraction limited, long working distance monochromatic objective lens for efficient light collection. Consisting of four spherical lenses, it has a numerical aperture of 0.29, an effective focal length of 36 mm and a working distance of 36.5 mm. This inexpensive system allows us to detect 8 · 104 fluorescence photons per second from a single cesium atom stored in a magneto-optical trap.

Keywords: Fluorescence detection; atom trapping

Document Type: Original Article


Affiliations: Institut für Angewandte Physik, Universität Bonn, Wegelerstrasse 8, 53115 Bonn, Germany

Publication date: June 1, 2002

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