Low-order AO system in LAMOST

Xiangyan Yuan; Xiangqun Cui; Genrong Liu; Yong Zhang; Yongjun Qi

doi:10.1117/12.669749

28 June 2006 Low-order AO system in LAMOST

Xiangyan Yuan, Xiangqun Cui, Genrong Liu, Yong Zhang, Yongjun Qi

Proceedings Volume 6272, Advances in Adaptive Optics II; 62723O (2006) https://doi.org/10.1117/12.669749
Event: SPIE Astronomical Telescopes + Instrumentation, 2006, Orlando, Florida , United States

Abstract

The large sky area multi-object fiber spectroscopic telescope (LAMOST) is a special reflecting Schmidt telescope with its main optical axis on the meridian plane tilted by an angle of 25° to the horizontal. The clear aperture is 4m, working in optical band. The light path is 60m long when working in observing mode and it will be doubled if work in auto-collimation mode. So the image quality is affected clearly by the ground seeing and the dome seeing. In order to improve the seeing condition of the long light path, we enclosed the spherical primary and the focus unit in a tunnel enclosure and cooled the tunnel. This is an effective but passive method. Corresponding experiments and simulations show the main part of the aberrations caused by the ground seeing and dome seeing is slowly changed low order items such as tip-tilt, defocus, astigmatism, coma and spherical aberration. Thus we plan to develop the low-order AO system based on the low-cost 37-channel OKO deformable mirror for the telescope to better the ground seeing and the dome seeing, not aimed to reach diffraction limited image. This work is being carried on now.

Citation Download Citation

Xiangyan Yuan, Xiangqun Cui, Genrong Liu, Yong Zhang, and Yongjun Qi "Low-order AO system in LAMOST", Proc. SPIE 6272, Advances in Adaptive Optics II, 62723O (28 June 2006); https://doi.org/10.1117/12.669749

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