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Optics Letters

Optics Letters


  • 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)

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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

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)

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