Determination of optical field generated by a microlens using digital holographic method |
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Authors: | T Kozacki M Józwik R Jó?wicki |
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Institution: | (1) Department of Physics, University of South Florida, 4202 E. Fowler Avenue, Tampa, FL 33620, USA |
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Abstract: | In the paper, application of the digital holographic method for full field characterization of the beam generated by microlenses
is considered. For this goal, the laboratory setup was designed based on Mach-Zehnder interferometry with the additional reference
channel. The beam generated by a microlens was imaged by an afocal system and intensity distributions or interferograms (holograms)
were registered by CCD camera. The digital holography using one image allows us to determine microlens parameters, i.e., focal
length, aberrations, and shape. The optimum conditions to determine the surface shape of a microlens using holographic method
have been found. We compare obtained results with geometrical and interferometric measurements. We show the advantage of digital
holography for a shape microlens determination (improved accuracy), aberrations, and focal length (characterization facility).
Through optimum refocusing, the digital holography gives more precise shape. The paper is accompanied with computer simulations
and the experimental measurement data for geometrical, interferometric, and holographic methods. |
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Keywords: | |
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