A modified phase diversity wavefront sensor with a diffraction grating

doi:10.1088/1674-1056/21/9/094201

Abstract Phase diversity wavefront sensor is one of the useful tools to estimate the wavefront aberration, and it is often used as a wavefront sensor in adaptive optics system. However, the performance of the traditional phase diversity wavefront sensor is limited by the accuracy and dynamic ranges of the intensity distribution at focus and defocus positions of the CCD camera. In this paper, a modified phase diversity wavefront sensor based on a diffraction grating is proposed to improve the ability to measure the wavefront aberration with larger amplitude and higher spatial frequency. The basic principle and the optics construction of the proposed method are also described in detail. The noise propagation property of the proposed method is also analysed by using the numerical simulation method, and comparison between the diffraction grating phase diversity wavefront sensor and the traditional phase diversity wavefront sensor is also made. The simulation results show that the diffraction grating phase diversity wavefront sensor can obviously improve the ability to measure the wavefront aberration, especially the wavefront aberration with larger amplitude and higher spatial frequency.

Keywords: phase diversity wavefront sensor diffraction grating aberration signal-to-noise ratio

Received: 31 December 2011
Revised: 18 January 2012
Accepted manuscript online:

PACS:	42.15.Fr	(Aberrations)
	42.25.Fx	(Diffraction and scattering)
	42.30.Rx	(Phase retrieval)
	42.40.Pa	(Volume holograms)

Corresponding Authors: Luo Qun
E-mail: littlepuppet_luo@sina.com

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Luo Qun (罗群), Huang Lin-Hai (黄林海), Gu Nai-Ting (顾乃庭), Rao Chang-Hui (饶长辉) A modified phase diversity wavefront sensor with a diffraction grating 2012 Chin. Phys. B 21 094201

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A modified phase diversity wavefront sensor with a diffraction grating

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