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Proceedings Paper

Designing a diffractive optical element used as a ring-beam convertor to control the wavefront propagation in a three-dimensional space
Author(s): Junfeng Lu; JingJuan Zhang; Yan Zhang; Guo Hai Situ
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Paper Abstract

Conventional diffractive optical elements (DOEs) are usually designed to produce a predetermined function or light distribution on a single transverse plane. As we know, the unconventional light distributions are generated within a three-dimensional domain. Such as a ring-beam convertor described in this paper, the distribution with a ring profile must be consistent in any cross section. A phase-only diffractive optical element with 1 6 levels is designed for controlling the wave-front propagation within a given three-dimensional space. And it is a rotation symmetrical binary optical element that is used to convert the input uniform beam to a ring output beam. We designed this convertor by the Simulated Annealing method (SA) the iterative method based on the Block-Iterative weighted projections algorithm (BIWP) and the SA-BIWP hybrid algorithm. In this paper, we emphatically investigated and compared these three phase retrieval algorithms. The results of numerical simulation show that the procedure of the hybrid algorithm converges more stably to an optimal solution close to the global optimum with an acceptable computing time. The diffractive efficiency is higher and the energy of the output beam in the ring domain is more concentrated. Along the direction of the input beam, the intensity of the beam in each transverse plane is accordant. What's more, the hybrid algorithm is applicable to be employed to solve other discrete stochastic optimization problem ofthe design of a DOE.

Paper Details

Date Published: 10 September 2002
PDF: 9 pages
Proc. SPIE 4928, MEMS/MOEMS Technologies and Applications, (10 September 2002); doi: 10.1117/12.483189
Show Author Affiliations
Junfeng Lu, Chinese Academy of Sciences and Univ. of Science and Technology of China (China)
JingJuan Zhang, Chinese Academy of Sciences (China)
Yan Zhang, Chinese Academy of Sciences (China)
Guo Hai Situ, Chinese Academy of Sciences (China)

Published in SPIE Proceedings Vol. 4928:
MEMS/MOEMS Technologies and Applications
Guofan Jin; John S. McKillop; Kazuhiro Hane, Editor(s)

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