Fast reconstruction of off-axis digital holograms
based on digital spatial multiplexing
Bei Sha,
1,2
Xuan Liu,
1
Xiao-Lu Ge
1
and Cheng-Shan Guo
1,*
1
College of Physics and Electronics, Shandong Normal University, Jinan 250014, China
2
College of Physics and Electronic Engineering, Qilu Normal University, Jinan. 250200, China
*
guochsh@sdnu.edu.cn
Abstract: A method for fast reconstruction of off-axis digital holograms
based on digital multiplexing algorithm is proposed. Instead of the existed
angular multiplexing (AM), the new method utilizes a spatial multiplexing
(SM) algorithm, in which four off-axis holograms recorded in sequence are
synthesized into one SM function through multiplying each hologram with
a tilted plane wave and then adding them up. In comparison with the
conventional methods, the SM algorithm simplifies two-dimensional (2-D)
Fourier transforms (FTs) of four N*N arrays into a 1.25-D FTs of one N*N
arrays. Experimental results demonstrate that, using the SM algorithm, the
computational efficiency can be improved and the reconstructed wavefronts
keep the same quality as those retrieved based on the existed AM method.
This algorithm may be useful in design of a fast preview system of dynamic
wavefront imaging in digital holography.
©2014 Optical Society of America
OCIS codes: (090.1995) Digital holography; (090.4220) Multiplex holography; (100.5070)
Phase retrieval; (100.5088) Phase unwrapping.
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Received 15 Jul 2014; revised 27 Aug 2014; accepted 28 Aug 2014; published 15 Sep 2014
22 September 2014 | Vol. 22, No. 19 | DOI:10.1364/OE.22.023066 | OPTICS EXPRESS 23066