Differential phase retrieval based on phase modulating for wavefront detection

作者：Huang, Jianhui; Jin, Huiliang^*; Ye, Qian; Meng, Guoxiang

来源：Applied Physics B: Lasers and Optics , 2018, 124(4): 58.

DOI：10.1007/s00340-018-6928-7

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• SEQUENCE

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.

• 出版日期2018-4
• 单位上海交通大学