Testing the pyramid wavefront sensor without modulation used in the closed-loop adaptive optics system

Shengqian Wang; Changhui Rao; Ang Zhang; Xuejun Zhang; Kai Wei; Yu Tian; Zhou Liao; Cheng Zhang; Hao Xian; Xiaojun Zhang; Ling Wei

doi:10.1117/12.925777

13 September 2012 Testing the pyramid wavefront sensor without modulation used in the closed-loop adaptive optics system

Shengqian Wang, Changhui Rao, Ang Zhang, Xuejun Zhang, Kai Wei, Yu Tian, Zhou Liao, Cheng Zhang, Hao Xian, Xiaojun Zhang, Ling Wei

Author Affiliations +

Proceedings Volume 8447, Adaptive Optics Systems III; 84476K (2012) https://doi.org/10.1117/12.925777
Event: SPIE Astronomical Telescopes + Instrumentation, 2012, Amsterdam, Netherlands

Abstract

The pyramid wavefront sensor is an innovative device with the special characteristics of variable gain and adjustable sampling in real time to enable an optimum match of the system performance, which make it an attractive option for next generation adaptive optics system compared with the Shack-Hartmann. At present most of the pyramid wavefront sensor are used with modulation based on oscillating optical component in order to give a linear measurement of the local tilt, but the PWFS without modulation would greatly simplify the optical and mechanical design of the adaptive optics system and also give highest sensitivity as expected to be achieved. In this paper we describe the optical setup of our adaptive optics system with nonmudulated pyramid wavefront sensor. In this system, the pyramid wavefront sensor with 8×8 sub-apertures in the pupil diameter has been designed, and the deformable mirror with 61 actuators based on the liquid-crystal spatial light modulator is used to introduce aberrations into the system, as well as to correct them afterwards. The closed-loop correction results of single order Zernike aberrations and the Kolmogorov turbulence phase screen are given to show that the PWFS without modulation can work as expected for closed-loop system.

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Shengqian Wang, Changhui Rao, Ang Zhang, Xuejun Zhang, Kai Wei, Yu Tian, Zhou Liao, Cheng Zhang, Hao Xian, Xiaojun Zhang, and Ling Wei "Testing the pyramid wavefront sensor without modulation used in the closed-loop adaptive optics system", Proc. SPIE 8447, Adaptive Optics Systems III, 84476K (13 September 2012); https://doi.org/10.1117/12.925777

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