Optimum defocus diversity in phase diversity wave-front sensing using Cramér-Rao theorem

li fei; rao changhui

Volume 23 Issue 06

Jun. 2011

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li fei, rao changhui. Optimum defocus diversity in phase diversity wave-front sensing using Cramér-Rao theorem[J]. High Power Laser and Particle Beams, 2011, 23.

Citation:

li fei, rao changhui. Optimum defocus diversity in phase diversity wave-front sensing using Cramér-Rao theorem[J]. High Power Laser and Particle Beams, 2011, 23.

li fei, rao changhui. Optimum defocus diversity in phase diversity wave-front sensing using Cramér-Rao theorem[J]. High Power Laser and Particle Beams, 2011, 23.

Citation:

li fei, rao changhui. Optimum defocus diversity in phase diversity wave-front sensing using Cramér-Rao theorem[J]. High Power Laser and Particle Beams, 2011, 23.

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Optimum defocus diversity in phase diversity wave-front sensing using Cramér-Rao theorem

li fei^1,2,3,
rao changhui^1,2

1.
Institute of Optics and Electronics,Chinese Academy of Sciences,Chengdu 610209,China;
2.
The Key Laboratory on Adaptive Optics,Chinese Academy of Sciences,Chengdu 610209,China;
3.
College of Opto-Electronics Science and Engineering,National University of Defense Technology,Changsha 410073,China

Publish Date: 2011-06-28

Abstract

Abstract

Phase diversity wave-front sensing(PDWFS) is a method for estimating wave-front aberrations from two (or more) images whose pupil phases differ from one another with a known diversity phase. It can be used to estimate wave-front for point source as well as extended source. The accuracy of the estimate is relied on the diversity phase and is always given quantitatively in Cramér-Rao theorem. With defocus is used as the diversity mode, the effect of the object and the aberration on the optimum defocus is studied using Cramér-Rao theorem in this paper when the photons is enough. The results show that the optimum defocus does not depend on the peak-to-valley value or the spatial frequency of the aberration observably in the case of point source. For extended source, although the optimum defo
- wave-front sensing,
- optimum defocus,
- cramér-rao lower band,
- phase diversity

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