Journal
OPTICS EXPRESS
Volume 19, Issue 21, Pages 20244-20250Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.19.020244
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Funding
- National Natural Science Foundation of China [60502018, 61171005]
- BUAA
- Fundamental Research Fund for the Central Universities
- AVIC [CXY2010BH02]
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A method based on the transport of intensity equation (TIE) for phase retrieval is presented, which can retrieve the optical phase from intensity measurements in multiple unequally-spaced planes in the near-field region. In this method, the intensity derivative in the TIE is represented by a linear combination of intensity measurements, and the coefficient of the combination can be expressed by explicitly analytical form related to the defocused distances. The proposed formula is a generalization of the TIE with high order intensity derivatives. The numerical experiments demonstrate that the proposed method can improve the accuracy of phase retrieval with higher-order intensity derivatives and is more convenient for practical application. (C) 2011 Optical Society of America
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