Abstract
Wavefront aberration in optical imaging system reduces the image quality. The Gerchberg and Saxton algorithm is commonly applied to detect the wavefront from far-field intensities. Based on ‘alternating projection’, the algorithm is very sensitive to the initial phase guess, and can easily fall into a local optimal solution. In this paper, we propose an effective method based on phase modulation to obtain a favorable initial phase which ensures the GS iteration converge to the closely optimal solution. In the method, after the infocus image, add a suitable ‘phase mask’ to the incident beam and record the second far-field image. From the difference of the two images, a good approximation to the far-field phase can be solved directly, which reveals many crucial features of the exact far-field phase. With this value as the initial input, the GS iteration or other iterative Fourier algorithms would be able to achieve nearly global optimal phase retrieval.
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Acknowledgements
The authors would like to thank the funding: Ministry of Science and Technology of the People’s Republic of China (501100002855). National Basic Research Program of China (973 Program), 2015CB857100.
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Huang, J., Jin, H., Ye, Q. et al. Differential phase retrieval based on phase modulating for wavefront detection. Appl. Phys. B 124, 58 (2018). https://doi.org/10.1007/s00340-018-6928-7
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DOI: https://doi.org/10.1007/s00340-018-6928-7