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5 August 2009 Fabrication of Ge-Se-Sb chalcogenide glass with large size and its MTF performance
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In this paper, the methods of preparation of Ge-Se-Sb glasses with low impurity content were developed, and a large Ge-Sb-Se glass rod (φ85×80mm) with good quality was obtained. The physical and optical properties of the glass were measured. The optical homogeneity (Δn) at 2μm at different places inside the same bulk was less ±2×10-4. In order to accurately evaluate the infrared resolution of our prepared glass, a lens of f 19mm F/#1.3 was used to evalue its modulation transfer function (MTF) performance. The MTF value at 20cycles/mm for 20°C was 0.52. The area under MTF curve covers 82.466% of the image space, and has a value of 21.8 cycles/mm.
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S. Dai, M. Li, B. Peng, J. Zhu, X. Wang, X. Shen, L. Ding, T. Xu, and Q. Nie "Fabrication of Ge-Se-Sb chalcogenide glass with large size and its MTF performance", Proc. SPIE 7383, International Symposium on Photoelectronic Detection and Imaging 2009: Advances in Infrared Imaging and Applications, 738313 (5 August 2009);

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