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Proceedings Paper

Simulation and representation turbulent wavefront according to transformation Gaussian lasers into patterned light fields by diffractive micro-optics elements
Author(s): Yong Qu; Xinyu Zhang; Hongshi Sang; Changsheng Xie
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Paper Abstract

A design method of diffractive micro-optics elements based on the diffractive integral theory for simulating and representing the turbulent wavefront in infrared wavelength region, and the fabrication technologies mainly consisted of electron beam photolithography and low-cost anisotropic wet etching, are developed in this paper. We simulate the diffraction propagation process according to the Rayleigh-Sommerfeld (RS) diffractive theory or the angular spectrum diffraction theory. The modified Gerchberg-Saxton (GS) algorithm for modeling and simulation so as to easily realize the iterative transmission process from the input plane to the output, which is employed as the design optimization algorithm of diffractive micro-optics elements, is investigated. Several elements are fabricated quickly through a low cost semiconductor technological process. Infrared diffractive optical elements produced by the method are mainly used to form complex far field patterns related with atmospheric flow such as typical turbulence. The elements can transfer common Gaussian beams into desired patterns correspondent to atmospheric turbulence through creating fine phase microstructures with needed size and depth or height over the surface of the elements. The fine surface morphologies of the elements, which originate from the simple planar patterns in photomask and further etched into the wafer, are created by the software based on the phase distribution designed. The diffractive micro-optics elements for generating several typical light field patterns have been fabricated quickly. Experiments show that the method can achieve several special light field simulations. Future work will mainly include a more realistic model for light field generation in atmospheric turbulence.

Paper Details

Date Published: 23 August 2013
PDF: 8 pages
Proc. SPIE 8911, International Symposium on Photoelectronic Detection and Imaging 2013: Micro/Nano Optical Imaging Technologies and Applications, 89110S (23 August 2013); doi: 10.1117/12.2034699
Show Author Affiliations
Yong Qu, Huazhong Univ. of Science and Technology (China)
Xinyu Zhang, Huazhong Univ. of Science and Technology (China)
Hongshi Sang, Huazhong Univ. of Science and Technology (China)
Changsheng Xie, Huazhong Univ. of Science and Technology (China)


Published in SPIE Proceedings Vol. 8911:
International Symposium on Photoelectronic Detection and Imaging 2013: Micro/Nano Optical Imaging Technologies and Applications
Min Gu; Xiaocong Yuan; Min Qiu, Editor(s)

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