Abstract
This study utilizes the concept of polarization phase to introduce a circularly symmetric phase step in the aperture plane of an imaging system. Since the polarization phase can be controlled by variation of the polarization parameters involved, the effective focal length of the imaging system can be varied within a small range. In the proposed technique, the modification of the focal length is obtained by rotating a retarder at the input of the imaging system. A study of the PSFs at the shifted focal planes shows that the quality of the image in these planes is comparable to that produced by a diffraction-limited system at Gaussian focus. The focal plane displacement achievable is about 300 μm of a f/10 system at 550 nm.
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Chowdhury, D.R., Bhattacharya, K. & Chakroborty, A.K. Focal Shift in an Imaging System with Polarization-Phase Modulated Aperture Plane. J Opt 31, 117–128 (2002). https://doi.org/10.1007/BF03354700
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DOI: https://doi.org/10.1007/BF03354700