Abstract

We describe the practical implementation of a closed-loop adaptive-optics system incorporating a novel modal wave-front sensor. The sensor consists of a static binary-phase computer-generated holographic element, which generates a pattern of spots in a detector plane. Intensity differences between symmetric pairs of these spots give a direct measure of the Zernike mode amplitudes that are present in the input wave front. We use a ferroelectric liquid-crystal spatial light modulator in conjunction with a 4f system and a spatial filter as a wave-front correction element. We present results showing a rapid increase in Strehl ratio and focal spot quality as the system corrects for deliberately introduced aberrations.

© 2000 Optical Society of America

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References

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  1. J. W. Hardy, Adaptive Optics for Astronomical Telescopes (Oxford U. Press, Oxford, 1998).
  2. R. K. Tyson, Principles of Adaptive Optics (Academic, London, 1991).
  3. M. A. A. Neil, M. J. Booth, and T. Wilson, J. Opt. Soc. Am. A 17, 1098 (2000).
    [CrossRef]
  4. V. N. Mahajan, Appl. Opt. 5, 8121 (1994).
    [CrossRef]
  5. M. A. A. Neil, M. J. Booth, and T. Wilson, Opt. Lett. 23, 1849 (1998).
    [CrossRef]
  6. M. A. A. Neil, T. Wilson, and R. Juškaitis, J. Microsc. (Oxford) 197, 219 (2000).
    [CrossRef]

2000

M. A. A. Neil, M. J. Booth, and T. Wilson, J. Opt. Soc. Am. A 17, 1098 (2000).
[CrossRef]

M. A. A. Neil, T. Wilson, and R. Juškaitis, J. Microsc. (Oxford) 197, 219 (2000).
[CrossRef]

1998

1994

V. N. Mahajan, Appl. Opt. 5, 8121 (1994).
[CrossRef]

Booth, M. J.

Hardy, J. W.

J. W. Hardy, Adaptive Optics for Astronomical Telescopes (Oxford U. Press, Oxford, 1998).

Juškaitis, R.

M. A. A. Neil, T. Wilson, and R. Juškaitis, J. Microsc. (Oxford) 197, 219 (2000).
[CrossRef]

Mahajan, V. N.

V. N. Mahajan, Appl. Opt. 5, 8121 (1994).
[CrossRef]

Neil, M. A. A.

Tyson, R. K.

R. K. Tyson, Principles of Adaptive Optics (Academic, London, 1991).

Wilson, T.

Appl. Opt.

V. N. Mahajan, Appl. Opt. 5, 8121 (1994).
[CrossRef]

J. Microsc. (Oxford)

M. A. A. Neil, T. Wilson, and R. Juškaitis, J. Microsc. (Oxford) 197, 219 (2000).
[CrossRef]

J. Opt. Soc. Am. A

Opt. Lett.

Other

J. W. Hardy, Adaptive Optics for Astronomical Telescopes (Oxford U. Press, Oxford, 1998).

R. K. Tyson, Principles of Adaptive Optics (Academic, London, 1991).

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Figures (4)

Fig. 1
Fig. 1

Binary-phase plate computer-generated hologram (transmission values: white, 1; black, -1).

Fig. 2
Fig. 2

Experimental configuration of optical system: PBS 1, PBS2, polarizing beam splitters; FLCSLM1, FLCSLM2, ferroelectric liquid-crystal spatial light modulators.

Fig. 3
Fig. 3

Intensity pattern in the detector plane (a) before correction, (b) after one cycle, and (c) after nine cycles.

Fig. 4
Fig. 4

Improvement in Strehl ratio (relative to final frame) as a function of frame number.

Equations (3)

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a=S-1w.
an+1=an-μS-1wn,
an+1=an-μwn.

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