A kind of Shack-Hartmann wavefront sensor with extremely large number of subapertures for adaptive optics system of extremely large telescope

Ang Zhang; Changhui Rao; Xuejun Zhang; Zhou Liao; Kai Wei; Yudong Zhang; Wenhan Jiang

doi:10.1117/12.788348

16 July 2008 A kind of Shack-Hartmann wavefront sensor with extremely large number of subapertures for adaptive optics system of extremely large telescope

Ang Zhang, Changhui Rao, Xuejun Zhang, Zhou Liao, Kai Wei, Yudong Zhang, Wenhan Jiang

Author Affiliations +

Proceedings Volume 7015, Adaptive Optics Systems; 70154Z (2008) https://doi.org/10.1117/12.788348
Event: SPIE Astronomical Telescopes + Instrumentation, 2008, Marseille, France

Abstract

A kind of Multiple-Detecting-Branch (MDB) Shack-Hartmann wavefront sensor (SHWFS) with extremely large number of subapertures, in which the pupil is split into spatially several branches by a beam splitter and each branch is detected by a SHWFS with less subapertures comparatively, is proposed to use for the wavefront sensing of the adaptive optics system for extremely large telescope. All the signals from the CCDs of SHWFS must be synchronized by the specially developed hardware system. There are the angular error of the beam splitter and the circum-optical-axis rotary of CCDs besides of the error of the conventional SHWFS. In this paper, the principle of the MDB SHWFS is introduced and its errors are analyzed. The simulation and experimental results show that this kind of MDB SHWFS can be used to measure effectively the wavefront aberration of the total pupil.

Citation Download Citation

Ang Zhang, Changhui Rao, Xuejun Zhang, Zhou Liao, Kai Wei, Yudong Zhang, and Wenhan Jiang "A kind of Shack-Hartmann wavefront sensor with extremely large number of subapertures for adaptive optics system of extremely large telescope", Proc. SPIE 7015, Adaptive Optics Systems, 70154Z (16 July 2008); https://doi.org/10.1117/12.788348

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KEYWORDS

Charge-coupled devices

Wavefronts

Sensors

Wavefront sensors

Adaptive optics

CCD image sensors

Large telescopes

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