Abstract

We present an adaptive cross-correlation algorithm for a large dynamic range extended-scene Shack–Hartmann wavefront sensor. We show that it accurately measures very fine image shifts over many pixels under a variety of practical imaging conditions.

© 2008 Optical Society of America

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References

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    [CrossRef]
  2. T. R. Rimmele and R. R. Radick, Proc. SPIE 3353, 72 (1998).
    [CrossRef]
  3. L. A. Poyneer, D. W. Palmer, K. N. LaFortune, and B. Bauman, Proc. SPIE 5894, 58940N-1 (2005).
  4. L. G. Brown, ACM Comput. Surv. 24, 325 (1992).
    [CrossRef]
  5. L. A. Poyneer, Appl. Opt. 42, 5807 (2003).
    [CrossRef] [PubMed]
  6. V. Michau, J. M. Conan, T. Fusco, M. Nicolle, C. Robert, M. T. Velluet, and E. Piganueau, Proc. SPIE 6303, 63030B (2006).
    [CrossRef]
  7. P. A. Knutsson and M. O. Petersen, Opt. Express 13, 9527 (2005).
    [CrossRef] [PubMed]
  8. E. Sidick, R. M. Morgan, J. J. Green, C. M. Ohara, and D. C. Redding, Proc. SPIE 6687, 668710 (2007).
    [CrossRef]

2007 (1)

E. Sidick, R. M. Morgan, J. J. Green, C. M. Ohara, and D. C. Redding, Proc. SPIE 6687, 668710 (2007).
[CrossRef]

2006 (2)

V. Michau, J. M. Conan, T. Fusco, M. Nicolle, C. Robert, M. T. Velluet, and E. Piganueau, Proc. SPIE 6303, 63030B (2006).
[CrossRef]

S. Thomas, T. Fusco, A. Tokovinin, M. Nicolle, V. Michau, and G. Rousset, Mon. Not. R. Astron. Soc. 371, 323 (2006).
[CrossRef]

2005 (2)

L. A. Poyneer, D. W. Palmer, K. N. LaFortune, and B. Bauman, Proc. SPIE 5894, 58940N-1 (2005).

P. A. Knutsson and M. O. Petersen, Opt. Express 13, 9527 (2005).
[CrossRef] [PubMed]

2003 (1)

1998 (1)

T. R. Rimmele and R. R. Radick, Proc. SPIE 3353, 72 (1998).
[CrossRef]

1992 (1)

L. G. Brown, ACM Comput. Surv. 24, 325 (1992).
[CrossRef]

ACM Comput. Surv. (1)

L. G. Brown, ACM Comput. Surv. 24, 325 (1992).
[CrossRef]

Appl. Opt. (1)

Mon. Not. R. Astron. Soc. (1)

S. Thomas, T. Fusco, A. Tokovinin, M. Nicolle, V. Michau, and G. Rousset, Mon. Not. R. Astron. Soc. 371, 323 (2006).
[CrossRef]

Opt. Express (1)

Proc. SPIE (4)

T. R. Rimmele and R. R. Radick, Proc. SPIE 3353, 72 (1998).
[CrossRef]

L. A. Poyneer, D. W. Palmer, K. N. LaFortune, and B. Bauman, Proc. SPIE 5894, 58940N-1 (2005).

V. Michau, J. M. Conan, T. Fusco, M. Nicolle, C. Robert, M. T. Velluet, and E. Piganueau, Proc. SPIE 6303, 63030B (2006).
[CrossRef]

E. Sidick, R. M. Morgan, J. J. Green, C. M. Ohara, and D. C. Redding, Proc. SPIE 6687, 668710 (2007).
[CrossRef]

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Figures (3)

Fig. 1
Fig. 1

(a) SH extended-scene subimage array obtained with a bar target on our SH wavefront sensor testbed. (b) One 64 × 64 pixel subimage of the SH extended scene. The white frame shows a 32 × 32 pixel ( N = 32 ) subaperture, and the black frame shows a 16 × 16 pixel ( M = 16 ) subaperture. These subapertures are referred to as big and small cells, respectively, in this paper.

Fig. 2
Fig. 2

Comparison of (a) estimate errors and (b) average numbers of iterations corresponding to different image-shifting tolerances. The error bars in (a) correspond to the standard deviation of the estimate errors obtained from the 60 different images. See the main text for more information.

Fig. 3
Fig. 3

Comparison of OPD maps reconstructed from the offsets of subimages measured with a point source and a bar target extended scene, respectively. The units of the color-bar label are nanometers. The “F” letter pattern in each OPD map was produced by poking the appropriate actuators on the DM.

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