相位恢复算法在量子关联衍射成像中的应用研究

Application of Phase Retrieval Algorithm to Quantum Correlated Diffraction Imaging

随着研究工作的逐步深入,目前已经利用经典热光源实现了关联衍射成像,使得该技术有望在X射线以及中子衍射成像等方面得到广泛应用。在实验利用非相干光得到物体无透镜傅里叶变换频谱的基础上,采用误差消除与输入输出恢复算法,并结合过采样理论,实现了实验所用物体透射率函数的恢复。分别得到了纯振幅物体的振幅分布函数与纯相位物体的相位分布函数。此外,还讨论了实验所得傅里叶变换频谱的噪声等因素对图像恢复结果的影响。

With our research going deeply, quantum correlated diffraction imaging can be accomplished by use of classical thermal source now, which indicates its wide application in X-ray and neutron diffraction imaging. The object transmission functions are successfully retrieved from the lensless Fourier transform frequency spectrums, which are obtained in experiment using incoherent light. Using the error reduction algorithm and the input-output algorithm integrated with over sampling theory, the amplitude distribution function of amplitude-only object and the phase distribution function of pure-phase object are retrieved successfully. The influence of the noise of Fourier transform frequency spectrum in the experiment on the retrieval result is also discussed.