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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: James C. Wyant
  • Vol. 47, Iss. 23 — Aug. 10, 2008
  • pp: 4297–4301

Open-loop correction of horizontal turbulence: system design and result

Quanquan Mu, Zhaoliang Cao, Dayu Li, Lifa Hu, and Li Xuan  »View Author Affiliations


Applied Optics, Vol. 47, Issue 23, pp. 4297-4301 (2008)
http://dx.doi.org/10.1364/AO.47.004297


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Abstract

Adaptive optics systems often work in a closed-loop configuration due to the hysteretic and nonlinearity properties of conventional deformable mirrors. Because of the high-precision wavefront generation and nonhysteretic properties of liquid-crystal devices, the open-loop control becomes possible. Open-loop control is a requirement for advanced adaptive optics concepts. We designed an open-loop adaptive optics system with a liquid-crystal-on-silicon wavefront corrector. This system is simple, fast, and can save much more light compared to conventional liquid-crystal-based closed-loop systems. The detailed principle, construction, and operation are discussed. The 500 m horizontal turbulence correction experiment was done using a 250 mm telescope in the laboratory. The whole system can reach a 60 Hz correction frequency. Evaluation of the correction precision was done at closed-loop configuration, which is 0.2 λ ( λ = 0.633 μm ) in peak to valley. The dynamic image under open-loop correction got the same resolution compared to closed-loop correction. The whole system reached 0.68 arc sec resolution capability at open-loop correction, which is slightly larger than the system’s diffraction-limited resolution of 0.65 arc sec .

© 2008 Optical Society of America

OCIS Codes
(010.1080) Atmospheric and oceanic optics : Active or adaptive optics
(220.4830) Optical design and fabrication : Systems design
(230.3720) Optical devices : Liquid-crystal devices

ToC Category:
Optical Design and Fabrication

History
Original Manuscript: May 13, 2008
Revised Manuscript: July 12, 2008
Manuscript Accepted: July 16, 2008
Published: August 8, 2008

Citation
Quanquan Mu, Zhaoliang Cao, Dayu Li, Lifa Hu, and Li Xuan, "Open-loop correction of horizontal turbulence: system design and result," Appl. Opt. 47, 4297-4301 (2008)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-47-23-4297

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Supplementary Material


» Media 1: MPG (3258 KB)     
» Media 2: MPG (3444 KB)     

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