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26 July 2016 First light of the deformable secondary mirror-based adaptive optics system on 1.8m telescope
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An adaptive optics system (AOS), which consists of a 73-element piezoelectric deformable secondary mirror (DSM), a 9x9 Shack-Hartmann wavefront sensor and a real time controller has been integrated on the 1.8m telescope at the Gaomeigu site of Yunnan Astronomical Observatory, Chinese Academy of Sciences. Compared to the traditional AOS on Coude focus, the DSM AOS adopts much less reflections and consequently restrains the thermal noise and increases the energy transmitting to the system. Before the first on-sky test, this system has been demonstrated in the laboratory by compensating the simulated atmospheric turbulence generated by a rotating phase screen. A new multichannel-modulation calibration method which is used to measure the DSM based AOS interaction matrix is proposed. After integration on the 1.8m telescope, the closed-loop compensation of the atmospheric turbulence with the DSM based AOS is achieved, and the first light results from the on-sky experiment are reported.
© (2016) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Youming Guo, Ang Zhang, Xinlong Fan, Changhui Rao, Ling Wei, Hao Xian, Kai Wei, Xiaojun Zhang, Chunlin Guan, Min Li, Luchun Zhou, Kai Jin, Junbo Zhang, Longfeng Zhou, Xuejun Zhang, and Yudong Zhang "First light of the deformable secondary mirror-based adaptive optics system on 1.8m telescope", Proc. SPIE 9909, Adaptive Optics Systems V, 99091D (26 July 2016);

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