Super-resolution imaging in digital holography by using dynamic grating with a spatial light modulator |
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| Affiliation: | 1. College of Applied Sciences, Beijing University of Technology, No. 100 Pingleyuan Rd, Beijing 100124, China;2. School of Physics and Electronics Science, Shanxi Datong University, Datong 037009, Shanxi, China;3. Institute of Information Photonics Technology, Beijing University of Technology, Beijing 100124, China;1. Department of Physics, Faculty of Science, University of Damietta, New Damietta, Egypt;2. BIAS (Bremer Institut für Angewandte Strahltechnik), Bremen, Germany;1. School of Physics, Shandong University, Jinan 250100, China;2. Department of Engineering Mechanics, Dalian University of Technology, Dalian 116024, China;1. State Key Laboratory of Modern Optical Instrumentation, Department of Optical Engineering, Zhejiang University, Hangzhou 310027, China;2. Key Laboratory of Biomedical Engineering of Ministry of Education, Department of Biomedical Engineering Hangzhou 310027, China;1. University of Valencia, 3D Imaging and Display Laboratory, Department of Optics, E-46100 Burjassot, Spain;2. Universidad Nacional de Colombia Sede Medellin, School of Physics, A.A. 3840, Medellin 050034, Colombia |
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| Abstract: | A super-resolution imaging method using dynamic grating based on liquid-crystal spatial light modulator (SLM) is developed to improve the resolution of a digital holographic system. The one-dimensional amplitude cosine grating is loaded on the SLM, which is placed between the object and hologram plane in order to collect more high-frequency components towards CCD plane. The point spread function of the system is given to confirm the separation condition of reconstructed images for multiple diffraction orders. The simulation and experiments are carried out for a standard resolution test target as a sample, which confirms that the imaging resolution is improved from 55.7 μm to 31.3 μm compared with traditional lensless Fourier transform digital holography. The unique advantage of the proposed method is that the period of the grating can be programmably adjusted according to the separation condition. |
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| Keywords: | Digital holography Super-resolution Grating Spatial light modulator |
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