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Measurement of the three-dimensional intensity distribution in the neighborhood of a paraxial focus

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Abstract

We describe a technique for measuring the three-dimensional (3D) intensity distribution of a paraxial focus, based on scanning a CCD image sensor along the optical axis and on subsequently analyzing the data. We demonstrate the possibility of measuring high-resolution 3D intensity maps of the focal field, down to intensities of more than 5 orders of magnitude below that in the focal point, and show the excellent agreement with scalar diffraction theory. Further applications of the technique are indicated.

© 1997 Optical Society of America

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