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Proceedings Paper

Small angle expansion: a solution to the phase-retrieval problem using generalized phase diversity in pupil space
Author(s): Sijiong Zhang; Heather I. Campbell; Alan H. Greenaway
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Paper Abstract

Phase diversity is a phase-retrieval algorithm that uses a pair of defocused intensity images taken symmetrically about the wavefront to be determined. Generalised phase diversity is a phase-retrieval algorithm that uses diversity functions other than defocus. The approach adopted assumes that unknown phase changes satisfy the small-angle approximation over spatial regions that can be selected by choice of the diversity function. For smooth functions, and for discontinuous functions with only small discontinuities, this leads to a very simple analytic solution. Computer simulations were used to validate this method for the retrieved phase.

Paper Details

Date Published: 8 June 2006
PDF: 9 pages
Proc. SPIE 6018, 5th International Workshop on Adaptive Optics for Industry and Medicine, 60181C (8 June 2006); doi: 10.1117/12.669382
Show Author Affiliations
Sijiong Zhang, Heriot-Watt Univ. (United Kingdom)
Heather I. Campbell, Heriot-Watt Univ. (United Kingdom)
Alan H. Greenaway, Heriot-Watt Univ. (United Kingdom)


Published in SPIE Proceedings Vol. 6018:
5th International Workshop on Adaptive Optics for Industry and Medicine
Wenhan Jiang, Editor(s)

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