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

Qing Han; Jian Wang; Jianzhong Zhang; Qiang Sun

doi:10.1117/1.OE.55.8.085105

23 August 2016 Diffraction analysis for digital micromirror device scene projectors in the long-wave infrared

Qing Han, Jian Wang, Jianzhong Zhang, Qiang Sun

Author Affiliations +

Optical Engineering, Vol. 55, Issue 8, 085105 (August 2016). https://doi.org/10.1117/1.OE.55.8.085105

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.

Citation Download Citation

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

Published: 23 August 2016

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