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Optical Engineering

Diffraction analysis for digital micromirror device scene projectors in the long-wave infrared
Author(s): Qing Han; Jian Wang; Jianzhong Zhang; Qiang Sun
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Paper Abstract

Diffraction effects play a significant role in scene projectors by digital micromirror devices (DMDs) in the long-wave infrared (IR) band (8 to 12 μm). The contrast provided by these projector systems can become noticeably worse because of the diffraction characteristics of the DMD. The actual diffraction characteristics of the DMD deviate significantly from the predictions of scalar diffraction theory in the long-wave IR. To address this issue, we built a vector diffraction-grating model of the DMD; the diffraction grating model is simulated with MATLAB. Furthermore, we analyze the effect of incident angle and polarization, which are the main factors that decrease the contrast of DMD-based scene projectors in the long-wave IR. Finally, an effective method to improve the contrast of the scene projector system is given, and the maximum contrast of the scene projector system is ∼0.7.

Paper Details

Date Published: 23 August 2016
PDF: 6 pages
Opt. Eng. 55(8) 085105 doi: 10.1117/1.OE.55.8.085105
Published in: Optical Engineering Volume 55, Issue 8
Show Author Affiliations
Qing Han, Univ. of Chinese Academy of Sciences (China)
Changchun Institute of Optics, Fine Mechanics and Physics (China)
Jian Wang, Changchun Institute of Optics, Fine Mechanics and Physics (China)
Jianzhong Zhang, Changchun Institute of Optics, Fine Mechanics and Physics (China)
Qiang Sun, Changchun Institute of Optics, Fine Mechanics and Physics (China)


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