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.

© Optical Society of America

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References

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  1. J. M. Beckers, "Increasing the size of the isoplanatic patch with multi-conjugate adaptive optics, in ESO Symposium on Large Telescopes and Their Instrumentation M.-H. Ulrich, ed. (ESO Proc, Garching) 693-703 (1988)
  2. B. Ellerbroek, "First-order performance evaluation of adaptive-optics systems for atmospheric-turbulence compensation in extended-field-of-view astronomical telescopes, J. Opt. Soc. Am. A 11, 783-805 (1994)
    [CrossRef]
  3. R. Ragazzoni, E. Marchetti and G. Valente, "Adaptive-optics corrections available for the whole sky, Nature (London) 403, 54-56 (2000)
    [CrossRef]
  4. D. C. Johnston and B. M. Welsh, "Analysis of multiconjugate adaptive optics, J. Opt. Soc. Am. A 11 394-408 (1994)
    [CrossRef]
  5. M. A. A. Neil, M. J. Booth, T. Wilson, "Dynamic wave-front generation for the characterization and testing of optical systems, Opt. Lett. 23 1849-1851 (1998)
    [CrossRef]
  6. R. J. Lane, A. Glindemann, J. C. Dainty, "Simulation of a Kolmogorov phase screen, Waves Random Media 2, 209-224 (1992)
    [CrossRef]
  7. A. Zadrozny, M. P. J. L. Chang, D. F. Buscher, R. M. Myers, A. P. Doel, C. N. Dunlop, R. M. Sharples and R. L. Arnold, In ESO/SPIE Topical Meeting on Astronomy with Adaptive Optics, ed. D. Bonaccini (1999)
  8. N. Doble, G. D. Love, D. F. Buscher, R. M. Myers and A. Purvis, "The use of image quality metrics for correction of non-common path errors in the ELECTRA adaptive optics system, Proc. SPIE 3749 785, ICO 18th Congress (1999)
    [CrossRef]
  9. F. Roddier, M. J. Northcott, J. E. Graves, and D. L. McKenna. "One-dimensional spectra of turbulence-induced Zernike aberrations: time delay and isoplanicity error in partial adaptive compensation, J. Opt. Soc. Am. A 10 957-965 (1993)
    [CrossRef]

Other (9)

J. M. Beckers, "Increasing the size of the isoplanatic patch with multi-conjugate adaptive optics, in ESO Symposium on Large Telescopes and Their Instrumentation M.-H. Ulrich, ed. (ESO Proc, Garching) 693-703 (1988)

B. Ellerbroek, "First-order performance evaluation of adaptive-optics systems for atmospheric-turbulence compensation in extended-field-of-view astronomical telescopes, J. Opt. Soc. Am. A 11, 783-805 (1994)
[CrossRef]

R. Ragazzoni, E. Marchetti and G. Valente, "Adaptive-optics corrections available for the whole sky, Nature (London) 403, 54-56 (2000)
[CrossRef]

D. C. Johnston and B. M. Welsh, "Analysis of multiconjugate adaptive optics, J. Opt. Soc. Am. A 11 394-408 (1994)
[CrossRef]

M. A. A. Neil, M. J. Booth, T. Wilson, "Dynamic wave-front generation for the characterization and testing of optical systems, Opt. Lett. 23 1849-1851 (1998)
[CrossRef]

R. J. Lane, A. Glindemann, J. C. Dainty, "Simulation of a Kolmogorov phase screen, Waves Random Media 2, 209-224 (1992)
[CrossRef]

A. Zadrozny, M. P. J. L. Chang, D. F. Buscher, R. M. Myers, A. P. Doel, C. N. Dunlop, R. M. Sharples and R. L. Arnold, In ESO/SPIE Topical Meeting on Astronomy with Adaptive Optics, ed. D. Bonaccini (1999)

N. Doble, G. D. Love, D. F. Buscher, R. M. Myers and A. Purvis, "The use of image quality metrics for correction of non-common path errors in the ELECTRA adaptive optics system, Proc. SPIE 3749 785, ICO 18th Congress (1999)
[CrossRef]

F. Roddier, M. J. Northcott, J. E. Graves, and D. L. McKenna. "One-dimensional spectra of turbulence-induced Zernike aberrations: time delay and isoplanicity error in partial adaptive compensation, J. Opt. Soc. Am. A 10 957-965 (1993)
[CrossRef]

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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)

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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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