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

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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 26cm 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 100μs, respectively. The tracking residual root-mean-square error is less than 0.1arcsec, and the wavefront residual root-mean-square error is about 0.05 wavelengths (λ=550nm) 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

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