Ms. Yuan Zhao Profile

Yuan Zhao

at Taiyuan Univ of Science and Technology

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Proceedings Article | 15 October 2012 Paper

Diffractive pyramid wave-front sensor used for adaptive optics

Yuan Zhao, Xiaona Ding, Kun Wang, Hongyan Wei, Huan Yang, Dongmei Cai

Proceedings Volume 8420, 842009 (2012) https://doi.org/10.1117/12.977622

KEYWORDS: Sensors, Diffraction, Adaptive optics, Charge-coupled devices, Fabrication, Prototyping, Polishing, Modulation, Binary data, Wavefront sensors

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Wave-front sensor, as the main component of Adaptive optics system, detects light from the astronomic object or reference sources. It aims to improve the utilization of light, especially for AO system work with the faint objects. Compared with Shack-Hartmann sensor, pyramid wave-front sensor is a relatively new one with increased pupil sampling and spatial resolution. Pyramid wave-front sensor uses a refractive element (the pyramid) to produce four images of the entrance pupil. Usually, Single pyramid prototypes are made using the classical figuring and polishing techniques. This approach, however, is not only very time consuming but also does not guarantee a uniform repeatability of the optical characteristics of the pyramids. The loss of low frequency component increases due to the roofs existing on its vertexes. Moreover, stray light is introduced in the four images. We therefore are investigating a modified pyramidal optical components based on the binary optical concept. In this article we describe the diffractive pyramid prototypes using the micro fabrication technique. The parameters of the pyramid are discussed.

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