Collection Of theses on high power laser and plasma physics, 2016, 14 (1): 071203, Published Online: Mar. 23, 2017
Lens-free coherent modulation imaging with collimated illumination
100.5070 Phase retrieval 050.1970 Diffractive optics 120.5050 Phase measurement 070.0070 Fourier optics and signal processing
Abstract
We propose a lens-free coherent modulation imaging (CMI) method for reconstructing a general complex-valued wave field from a single frame of a diffraction pattern. A numerical Fourier transform is introduced in the iterative reconstruction process to replace the lens or zone plate used in the current CMI technique to adopt the constraint on the Fourier components of the exit wave field of the sample. While the complexity of the experimental setup is remarkably reduced by replacing the zone plate and additional accessories with the numerical processing, the energy fluence loss induced by the undesired diffraction orders of the zone plate can be also avoided. The feasibility of the proposed technique is verified experimentally with visible light.
Hua Tao, Suhas P. Veetil, Xingchen Pan, Cheng Liu, Jianqiang Zhu. Lens-free coherent modulation imaging with collimated illumination[J]. Collection Of theses on high power laser and plasma physics, 2016, 14(1): 071203.