Abstract

Multi-segment liquid crystal spatial light modulators have received much attention recently for use as high-precision wavefront control devices for use in astronomical and non-astronomical applications. They act much like piston only segmented deformable mirrors. In this paper we investigate the use of these devices in conjunction with a Shack-Hartmann wave-front sensor. Previous investigators have considered Zernike modal control algorithms. In this paper we consider a zonal algorithm in order to take advantage of high speed matrix multiply hardware which we have in hand.

© Optical Society of America

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References

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  1. G.D. Love, "Wavefront correction and production of Zernike modes with a liquid crystal SLM", Appl. Opt., 36, 1517-1524 (1997).
    [CrossRef] [PubMed]
  2. J. Gourlay, G.D. Love, P.M. Birch, R.M. Sharples, A. Purvis, A real-time closed-loop liquid crystal adaptive optics system: first results, Opt. Commun. 137, 17-21 (1997).
    [CrossRef]
  3. A. Kudryashov, J. Gonglewski, S. Browne, R. Highland, Liquid crystal phase modulator for adaptive optics. Temporal performance characterization, Opt. Commun. 141, 247-253 (1997).
    [CrossRef]
  4. W. Wild, E. Kibblewhite, R. Vuilleumier, "Sparse matrix wave-front estimators for adaptive-optics system for large ground-based telescopes," Opt. Lett. 20 (9), 995-957 (1995).
    [CrossRef]

Other

G.D. Love, "Wavefront correction and production of Zernike modes with a liquid crystal SLM", Appl. Opt., 36, 1517-1524 (1997).
[CrossRef] [PubMed]

J. Gourlay, G.D. Love, P.M. Birch, R.M. Sharples, A. Purvis, A real-time closed-loop liquid crystal adaptive optics system: first results, Opt. Commun. 137, 17-21 (1997).
[CrossRef]

A. Kudryashov, J. Gonglewski, S. Browne, R. Highland, Liquid crystal phase modulator for adaptive optics. Temporal performance characterization, Opt. Commun. 141, 247-253 (1997).
[CrossRef]

W. Wild, E. Kibblewhite, R. Vuilleumier, "Sparse matrix wave-front estimators for adaptive-optics system for large ground-based telescopes," Opt. Lett. 20 (9), 995-957 (1995).
[CrossRef]

Supplementary Material (1)

» Media 1: MOV (248 KB)     

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Figures (8)

Fig. 1
Fig. 1

Simulated one dimensional cross sections of Shack-Hartmann spot

Fig. 2
Fig. 2

Shack-Hartmann centroid error as a function of segment displacement

Fig. 3
Fig. 3

Arrangement of SLM Elements With Respect to Shack-Hartmann Sub-Apertures

Fig. 4
Fig. 4

Effect of SLM segment displacement on Shack-Hartmann Spots

Fig. 5
Fig. 5

Block Diagram Zonal Control of Spatial Light Modulator

Fig. 6
Fig. 6

Experimental Layout for Closed Loop Tests

Fig. 7
Fig. 7

Open and Closed Loop results with a Static Aberration

Fig. 8
Fig. 8

Dynamic Closed Loop Control [Media 1]

Equations (8)

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ϕ x = 3 2 ( a b )
ϕ y = c a + b 2
Φ = ΓX
Φ = [ ϕ x 11 ϕ x 12 · · ϕ y 11 ϕ y 12 · · ]
X = [ x 11 x 12 · · x 21 x 22 · · ]
Γ = [ 3 2 3 2 0 0 0 · 0 3 2 3 2 0 0 · · · · · · · 1 2 1 2 · 1 0 · 0 1 2 1 2 · 1 · ]
H = Γ T ( Γ T Γ ) 1
C k = C k 1 gH ( Φ Φ 0 )

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