High-resolution digital holographic imaging by using a spatial light modulator

Bin Li; Da-Yong Wang; Yun-Xin Wang; Lu Rong

doi:10.1117/12.2068134

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18 September 2014 High-resolution digital holographic imaging by using a spatial light modulator

Bin Li, Da-Yong Wang, Yun-Xin Wang, Lu Rong

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Proceedings Volume 9282, 7th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test and Measurement Technology and Equipment; 92820N (2014) https://doi.org/10.1117/12.2068134
Event: 7th International Symposium on Advanced Optical Manufacturing and Testing Technologies (AOMATT 2014), 2014, Harbin, China

Abstract

Digital holography is the product of the optical holography, computer technology and photoelectric detection technology, and has the advantage of high-speed, real-time, full field of view, non-contact and quantitative phase contrast imaging. However, the numerical aperture of the hologram is limited due to the smaller sensitive area of the photoelectric sensor and the larger pixel size, and it is uneasy to meet the practical requirement on the imaging resolution. An approach is presented to achieve the high-resolution digital holographic imaging based on a spatial light modulator(SLM). An amplitude spatial light modulator is placed between the object and the CCD in the lensless Fourier transform digital holographic imaging system. The distribution of a diffraction grating is loaded into the SLM. In this way, more light including the high-frequency content, diffracted from the object, can be collected by the CCD. The standard resolution target is used as the object. The reconstructed image is obtained by the Fresnel diffraction propagation algorithm, which exhibits three diffraction orders. The results show that the resolution is improved from 62.5 μm to 31.3 μm.

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Bin Li, Da-Yong Wang, Yun-Xin Wang, and Lu Rong "High-resolution digital holographic imaging by using a spatial light modulator ", Proc. SPIE 9282, 7th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test and Measurement Technology and Equipment, 92820N (18 September 2014); https://doi.org/10.1117/12.2068134

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