Optical Design and Engineering

Diffraction analysis for digital micromirror device scene projectors in the long-wave infrared

[+] Author Affiliations
Qing Han

University of Chinese Academy of Sciences, 19 Yuquan Road, Beijing 100049, China

Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, 77 Yingkou Road, Changchun 130033, China

Jian Wang, Jianzhong Zhang, Qiang Sun

Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, 77 Yingkou Road, Changchun 130033, China

Opt. Eng. 55(8), 085105 (Aug 23, 2016). doi:10.1117/1.OE.55.8.085105
History: Received June 20, 2016; Accepted August 8, 2016
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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.

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© 2016 Society of Photo-Optical Instrumentation Engineers

Citation

Qing Han ; Jian Wang ; Jianzhong Zhang and Qiang Sun
"Diffraction analysis for digital micromirror device scene projectors in the long-wave infrared", Opt. Eng. 55(8), 085105 (Aug 23, 2016). ; http://dx.doi.org/10.1117/1.OE.55.8.085105


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