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Appl Opt. 2002 Oct 10;41(29):6050-4.

Digital refraction distortion correction with an astigmatic coherence sensor.

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  • 1Beckman Institute and Electrical and Computer Engineering Department, University of Illinois at Urbana-Champaign, Urbana 61801, USA.


We demonstrate the sensing and correction of an isoplanatic refractive distortion (not lens aberrations), using the complete measurement of the partially coherent field in an aperture that the previously described astigmatic coherence sensor provides. Isoplanatic distortions, and in general distortions that do not cause energy loss, maintain the orthogonality of the coherent modes. We use the fact that a common distortion will occur to all coherent modes to separate the distortion from the source behind it, rather than requiring a reference source at a different wavelength. Digital deconvolution was performed on the full four-dimensional partially coherent field for simultaneously computing the distortion and the source intensity distribution.

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