15 September 2008 Alignment of vectorial shearing interferometer using a simple recognition algorithm
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Abstract
The vectorial shearing interferometer includes a pair of wedge prisms as a shearing system. Perfect alignment of the shearing system is crucial for the optimal detection and analysis of asymmetrical wave fronts. This paper describes a recognition algorithm for optical misalignment detection and prisms orientation based in the intensity pattern obtained in the calibration process. The key of the present algorithm is the comparison of a reference intensity pattern, against a sheared interferogram that depends on the wedge prism position. First, an optimum phase only filter is obtained from a set of reference images with the objective to discriminate between different phase changes. Then, the optimal filter is used in a digital correlator, which results in a simple and robust calibration system.
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Guillermo Garcia-Torales, Jorge Luis Flores, Josué Álvarez-Borrego, "Alignment of vectorial shearing interferometer using a simple recognition algorithm", Proc. SPIE 7073, Applications of Digital Image Processing XXXI, 707324 (15 September 2008); doi: 10.1117/12.795748; https://doi.org/10.1117/12.795748
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