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Dual-conjugate wavefront generation for adaptive optics

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Abstract

We present results of the isoplanatic performance of an astronomical adaptive optics system in the laboratory, by using a dual layer turbulence simulator. We describe how the performance of adaptive correction degrades with off-axis angle. These experiments demonstrate that it is now possible to produce quantifiable multi-layer turbulence in the laboratory as a precursor to constructing multi-conjugate adaptive optics.

©2000 Optical Society of America

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Figures (4)

Fig. 1.
Fig. 1. Optical setup for dual-conjugate wavefront generation. P1 to P3 polarizers; BS, beamsplitter; M1 and M2 mirrors. f1 to f4 are the focal lengths of lenses L1 to L4.
Fig. 2.
Fig. 2. Point spread functions for single layer turbulence with D/r 0=6. (i) Uncorrected on—axis, (ii) uncorrected off—axis, (iii) corrected on—axis, (iv) corrected off—axis.
Fig. 3.
Fig. 3. Point spread functions for dual layer turbulence with both layers having D/r 0=6. (i) Uncorrected on—axis, (ii) uncorrected off—axis, (iii) corrected on—axis, (iv) corrected off—axis. with increasing angle.
Fig. 4.
Fig. 4. Corrected Strehl ratio as a function of off—axis angle. Turbulence 1 (diamonds) and 2 (squares) - single layer turbulence. Turbulence 3 (crosses) and 4 (triangles) - dual layer turbulence. The turbulence strength for each curve is described in the text.

Equations (4)

Equations on this page are rendered with MathJax. Learn more.

θ 0 = 0.31 r 0 h ̅
r 0 = [ r i 5 3 ] 3 5
h ̅ = [ 0 h 5 3 C n 2 ( h ) dh 0 C n 2 ( h ) dh ] 3 5
S exp [ ( θ θ 0 ) 5 3 ] .
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