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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: Joseph N. Mait
  • Vol. 49, Iss. 31 — Nov. 1, 2010
  • pp: G129–G135

Performance of the 37-element solar adaptive optics for the 26 cm solar fine structure telescope at Yunnan Astronomical Observatory

Changhui Rao, Lei Zhu, Xuejun Rao, Chunlin Guan, Donghong Chen, Shanqiu Chen, Jun Lin, and Zizhong Liu  »View Author Affiliations


Applied Optics, Vol. 49, Issue 31, pp. G129-G135 (2010)
http://dx.doi.org/10.1364/AO.49.00G129


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Abstract

A 37-element solar adaptive optics system, which consists of a fine tracking loop with a tip/tilt mirror and a correlation tracker, and a high-order correction loop with a 37-element deformable mirror, a correlating Shack–Hartmann wavefront sensor, and a real-time controller, was built and installed at the 26 cm solar fine structure telescope of the Yunnan Astronomical Observatory in 2009. In this system, the absolute difference algorithm is used. A new architecture with field-programmable gate array (FPGA) and digital signal processor (DSP) for the real-time controller based on systolic array and pipeline was developed. The computational latencies of the fine tracking loop and high-order correction loop are about 35 and 100 μ s , respectively. The tracking residual root-mean-square error is less than 0.1       arcsec , and the wavefront residual root-mean-square error is about 0.05 wavelengths ( λ = 550 nm ) after correction. The observational results show that the contrast and resolution of the solar images are improved after the correction by this adaptive optics system.

© 2010 Optical Society of America

OCIS Codes
(010.1080) Atmospheric and oceanic optics : Active or adaptive optics
(110.1080) Imaging systems : Active or adaptive optics

ToC Category:
Adaptive Optics System

History
Original Manuscript: April 2, 2010
Revised Manuscript: August 3, 2010
Manuscript Accepted: August 4, 2010
Published: September 2, 2010

Citation
Changhui Rao, Lei Zhu, Xuejun Rao, Chunlin Guan, Donghong Chen, Shanqiu Chen, Jun Lin, and Zizhong Liu, "Performance of the 37-element solar adaptive optics for the 26 cm solar fine structure telescope at Yunnan Astronomical Observatory," Appl. Opt. 49, G129-G135 (2010)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-49-31-G129

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