Abstract

A wave-front sensor is described that uses a programmable moving aperture to scan an incoming wave front. The position of the diffraction spot is recorded behind an objective lens with a two-dimensional sensor and gives an estimate of the local slope at the aperture position. Then the wave front is reconstructed by processing of the slope data. The device is basically a programmable Hartmann wave-front sensor. Compared with a microlens Shack–Hartmann wave-front sensor, its much longer focal length provides higher resolution, although real-time operation is lost. A practical implementation of the new scanner with a liquid-crystal television as the programmable aperture is presented.

© 1999 Optical Society of America

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References

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  1. R. K. Tyson, Principles of Adaptive Optics (Academic, San Diego, Calif., 1991).
  2. R. V. Shack and B. C. Platt, J. Opt. Soc. Am. 61, 656 (1971).
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    [CrossRef]
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    [CrossRef] [PubMed]
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    [CrossRef]
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    [CrossRef] [PubMed]
  7. V. Laude, Opt. Commun. 153, 134 (1998).
    [CrossRef]
  8. F. Roddier and C. Roddier, Appl. Opt. 30, 1325 (1991).
    [CrossRef] [PubMed]
  9. W. H. Southwell, J. Opt. Soc. Am. 70, 998 (1980).

1998 (1)

V. Laude, Opt. Commun. 153, 134 (1998).
[CrossRef]

1994 (1)

1993 (1)

J. Primot, Appl. Opt. 32, 771 (1993).
[CrossRef]

1991 (1)

1988 (2)

1980 (1)

1971 (1)

R. V. Shack and B. C. Platt, J. Opt. Soc. Am. 61, 656 (1971).

Appl. Opt. (5)

J. Opt. Soc. Am. (2)

W. H. Southwell, J. Opt. Soc. Am. 70, 998 (1980).

R. V. Shack and B. C. Platt, J. Opt. Soc. Am. 61, 656 (1971).

Opt. Commun. (1)

V. Laude, Opt. Commun. 153, 134 (1998).
[CrossRef]

Other (1)

R. K. Tyson, Principles of Adaptive Optics (Academic, San Diego, Calif., 1991).

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Figures (3)

Fig. 1
Fig. 1

Schematic of the wave-front scanner: SLM, spatial light modulator.

Fig. 2
Fig. 2

Typical diffraction spot.

Fig. 3
Fig. 3

Reconstruction of the wave front after an ophthalmic progressive lens: (a) experimental slopes, (b) reconstructed wave front, (c) residual reconstruction error.

Equations (4)

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Wx,yx=xd-1f-1dx,
δθ=1/qp/d,
Δθ=Mp/d,
Wx,y=m=06n=06am,nPmxPny.

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