Portal de Periódicos da CAPES

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

1997; Optica Publishing Group; Volume: 36; Issue: 31 Linguagem: Inglês

10.1364/ao.36.008091

0003-6935

G. P. Karman, A. van Duijl, Marco W. Beijersbergen, J. P. Woerdman,

Optical measurement and interference techniques

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.