Dr. Maohe Li Profile

Dr. Maohe Li

Senior Research Scientist at Agiltron Inc

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Proceedings Article | 7 May 2009 Paper

Low cost molded optics for IR imaging

Jing Zhao, Vincent DiFilippo, Michael Li

Proceedings Volume 7298, 72983J (2009) https://doi.org/10.1117/12.819939

KEYWORDS: Chalcogenide glass, Glass molding, Glasses, Infrared imaging, Infrared lenses, Aluminum, Lenses, Optics manufacturing, Imaging systems, Spherical lenses

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Infrared sensors play a critical role in detection, guidance, and targeting in today's military systems and warfighter equipment, ranging from man-portable to space-borne. Although significant progress is being made in the development of IR imagers, another important component of IR sensors has not evolved significantly-the optics. Current IR lenses are primarily made of expensive single-crystal germanium with tedious mechanical fabrication operations that include grinding, polishing, and edging. There is an industry wide need for lower cost and higher performance IR lenses. Agiltron has developed a technology to directly mold IR lenses to net-shape without additional finishing operations. This manufacturing technology produces optics with many-fold reductions in cost, size, weight, and fabrication time. The ability to reproducibly manufacture aspheric optics with complex net-shapes reduces the number of lenses traditionally required for imaging systems, providing aberration correction as well as system weight and size reductions. Additionally, anti-reflective surfaces can be molded into the glass, eliminating the need for expensive AR coatings. This technology utilizes a new chalcogenide glass material that reduces temperature induced index of refraction changes to near zero, and has a thermal expansion coefficient similar to aluminum. The result is a new generation of low cost, high performance and thermally robust IR lens systems.

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