Abstract

We propose an algorithm to extend the dynamic range of tip-tilt (TT) for a Shack–Hartmann wave-front sensor. With this method, the dynamic range of TT is determined by the size of the whole CCD pixel array rather than the size of the sub-aperture. Thus the separate TT sensor in adaptive optics (AO) systems for optical telescope can be saved, which will simplify the systems and enhance the light energy efficiency. The proposed algorithm is computationally effective and appropriate for the real-time TT computation of AO systems. The simulated and experimental results show that the algorithm is robust to realistic scintillation and photon noise and can work well under poor observing conditions. For the given condition with $r_0$ of 5 cm at 550 nm and average flux of 100 photons per sub-aperture, the ultimate measurement accuracy of TT is about 5% pixels (peak-to-valley value).

© 2015 Optical Society of America

Wavefront detection method of a single-sensor based adaptive optics system

Chongchong Wang, Lifa Hu, Huanyu Xu, Yukun Wang, Dayu Li, Shaoxin Wang, Quanquan Mu, Chengliang Yang, Zhaoliang Cao, Xinghai Lu, and Li Xuan
Opt. Express 23(16) 21403-21413 (2015)

Sorting method to extend the dynamic range of the Shack–Hartmann wave-front sensor

Junwon Lee, Roland V. Shack, and Michael R. Descour
Appl. Opt. 44(23) 4838-4845 (2005)

A simple and robust method to extend the dynamic range of an aberrometer

C. Leroux and C. Dainty
Opt. Express 17(21) 19055-19061 (2009)

Effect of anisoplanatism on the measurement accuracy of an extended-source Hartmann-Shack wavefront sensor

Friedrich Wöger and Thomas Rimmele
Appl. Opt. 48(1) A35-A46 (2009)

Extension of the matched-filter algorithm to multiple guide star Shack–Hartmann wavefront sensor

Piotr Piatrou
Appl. Opt. 58(4) 841-849 (2019)