5 November 2014 Design of an ultra-thin dual band infrared system
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The ultra-thin imaging system using reflective multiple-fold structure has smaller volume and less weight while maintaining high resolution compared with conventional optical systems. The multi-folded approach can significantly extend focal distance within wide spectral range without incurring chromatic aberrations. In this paper, we present a dual infrared imaging system of four-folded reflection with two air-spaced concentric reflective surfaces. The dual brand IR system has 107mm effective focal length, 0.7NA, ±4° FOV, and 50mm effective aperture with 80mm outer diameter into a 25mm total thickness, which spectral response is 3~12μm.
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Ke Du, Ke Du, Xuemin Cheng, Xuemin Cheng, Qichao Lv, Qichao Lv, YiFei Hu, YiFei Hu, } "Design of an ultra-thin dual band infrared system", Proc. SPIE 9272, Optical Design and Testing VI, 92720U (5 November 2014); doi: 10.1117/12.2068798; https://doi.org/10.1117/12.2068798

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