The recording of digital hologram at short distance and reconstruction using convolution approach
Chen Li-Ping(陈利平)† and Lü Xiao-Xu(吕晓旭)‡
Laboratory of Photonic Information Technology, School of Information and Optoelectronic Science and Engineering, South China Normal University, Guangzhou 510006, China
Abstract By adopting in-line lensless Fourier setup and phase-shifting technique, we recorded the phase-shifting digital hologram at short distance. As the Fresnel diffraction condition is no longer valid, the convolution approach is chosen for the reconstruction. However, the simulated reference wave for the reconstruction would suffer from severe under-sampling due to the comparatively large pixel size. To solve this problem, sinc-interpolation is introduced to get the pixel-size of the hologram reduced prior to the reconstruction. The experimental results show that an object image of high fidelity is obtained with this method.
Received: 07 February 2008
Revised: 21 May 2008
Accepted manuscript online:
Fund: Project supported
by the National Natural Science Foundation of
China (Grant Nos 60747001 and 60467003).
Cite this article:
Chen Li-Ping(陈利平) and Lü Xiao-Xu(吕晓旭) The recording of digital hologram at short distance and reconstruction using convolution approach 2009 Chin. Phys. B 18 189
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