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Confocal fluorescence spectroscopy and anisotropy imaging system

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Abstract

We report the design and implementation of a laser scanning confocal fluorescence system with spectroscopy and anisotropy imaging capabilities. Confocal spectroscopy is achieved with a fiber pinhole that is inserted into and removed from the detection path as needed. Fluorescence anisotropy imaging is accomplished with a polarizing beam splitter placed after the conventional pinhole. Two orthogonal polarizations are detected simultaneously with balanced photomultiplier tubes. The quality of the axial sectioning that is achieved in the confocal fluorescence spectroscopy mode is demonstrated experimentally, and examples of polarization-sensitive fluorescence imaging are demonstrated in tumor cell monolayers.

© 2003 Optical Society of America

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