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Optics Letters

Optics Letters

| RAPID, SHORT PUBLICATIONS ON THE LATEST IN OPTICAL DISCOVERIES

  • Vol. 23, Iss. 13 — Jul. 1, 1998
  • pp: 995–997

Dynamic range expansion of a Shack--Hartmann sensor by use of a modified unwrapping algorithm

J. Pfund, N. Lindlein, and J. Schwider  »View Author Affiliations


Optics Letters, Vol. 23, Issue 13, pp. 995-997 (1998)
http://dx.doi.org/10.1364/OL.23.000995


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Abstract

An algorithm for expanding the dynamic range of Shack--Hartmann sensors is proposed. The distribution of the spot dislocations is treated with a modified unwrapping algorithm that is widely used in interferometry. The algorithm unwraps the spot dislocations and assigns the spots to their original subapertures, leading to a huge expansion of the dynamic range. For the proposed algorithm there remains a limitation on the maximum wave-front curvature instead of on the maximum wave-front slope. Examples are given that show spot fields that were wrapped four times; the measured wave front had a peak-to-valley value of 116 lambda .

© 1998 America

Citation
J. Pfund, N. Lindlein, and J. Schwider, "Dynamic range expansion of a Shack--Hartmann sensor by use of a modified unwrapping algorithm," Opt. Lett. 23, 995-997 (1998)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-23-13-995


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References

  1. I. Ghozeil, in ed. pp., in Optical Shop Testing, Wiley, York, 1978, 0323 349
  2. H. Sickinger, O. Falkenstrfer, N. Lindlein, and J. Schwider, Opt. Eng., 33, 2680, 1994
  3. T. L. Bruno, A. Wirth, and A. J. Jankevics, in Proc. SPIE, 1993
  4. H. Schreiber, O. Falkenstrfer, J. Schwider, and A. Zller, in Proc. SPIE, 1993
  5. N. H. Ching, D. Rosenfeld, and M. Braun, IEEE Trans. Image Process., 1, 355, 1992

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