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Optical Engineering

Extended depth-of-field imaging through radially symmetrical conjugate phase masks
Author(s): Shouqian Chen; Van Nhu Le; Zhigang Fan; Hong Cam Tran
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Paper Abstract

We proposed a radially symmetrical conjugate phase mask (PM) pair to yield an invariant imaging property for extending depth-of-field imaging. This conjugate PM pair is a two-radially symmetrical phase function with opposite orientation of the phase modulation. Compared with a single-radially symmetrical PM, the proposed conjugate PM pair shows a symmetrically imaging property on both sides of the focal plane and high magnitude of modulation transfer function (MTF). The quartic phase mask (QPM) with optimized phase parameters is employed to demonstrate our concept. Several evaluation approaches, including point-spread function, MTF, and image simulation, are used to realize the performance comparison among a traditional imaging system, an original QPM system, and a conjugate QPM. The results are proof that the proposed conjugate PM has a superior performance in extending depth of field imaging.

Paper Details

Date Published: 2 November 2015
PDF: 5 pages
Opt. Eng. 54(11) 115103 doi: 10.1117/1.OE.54.11.115103
Published in: Optical Engineering Volume 54, Issue 11
Show Author Affiliations
Shouqian Chen, Harbin Institute of Technology (China)
Van Nhu Le, Harbin Institute of Technology (China)
Zhigang Fan, Harbin Institute of Technology (China)
Hong Cam Tran, Nanjing Univ. of Science and Technology (China)

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