We propose and demonstrate an coherent imaging technique by using defocus grating. For the imaging system, the defocus grating combined with lens with short focal length is used to realize multiplane imaging on the lens' focal plane, simultaneously. Based on these multiplane images, Gerchberg-Saxton (GS) algorithm is used to reconstruct the complex amplitude distribution of the input imaging beam. By using computational imaging and digital wavefront distortion correction with stochastic parallel gradient descent (SPGD) algorithm, this technology can be used for joint estimation of both pupil aberrations and an high resolution image of the object, successfully.
Haotong Ma, Zongliang Xie, Bo Qi, Guowen Zhang, Ge Ren, and Sanhong Wang, "Coherent imaging by using defocus grating," Proc. SPIE 9992, Emerging Imaging and Sensing Technologies, 99920I (Presented at SPIE Security + Defence: September 29, 2016; Published: 25 October 2016); https://doi.org/10.1117/12.2242019.
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