Polarization-based compensation of astigmatism |
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Authors: | Chowdhury Dola Roy Bhattacharya Kallol Chakraborty Ajay K Ghosh Raja |
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Affiliation: | Department of Applied Physics, Calcutta University, 92, Acharya Prafulla Chandra Road, Calcutta 700009, India. dola_rc1@rediffmail.com |
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Abstract: | One approach to aberration compensation of an imaging system is to introduce a suitable phase mask at the aperture plane of an imaging system. We utilize this principle for the compensation of astigmatism. A suitable polarization mask used on the aperture plane together with a polarizer-retarder combination at the input of the imaging system provides the compensating polarization-induced phase steps at different quadrants of the apertures masked by different polarizers. The aberrant phase can be considerably compensated by the proper choice of a polarization mask and suitable selection of the polarization parameters involved. The results presented here bear out our theoretical expectation. |
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