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1 July 2014 Layered chalcogenide glass structures for IR lenses
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Abstract
A technique for fabricating novel infrared (IR) lenses can enable a reduction in the size and weight of IR imaging optics through the use of layered glass structures. These structures can range from having a few thick glass layers, mimicking cemented doublets and triplets, to having many thin glass layers approximating graded index (GRIN) lenses. The effectiveness of these structures relies on having materials with diversity in refractive index (large Δn) and dispersion and similar thermo-viscous behavior (common glass transition temperature, ΔTg = 10°C). A library of 13 chalcogenide glasses with broad IR transmission (NIR through LWIR bands) was developed to satisfy these criteria. The lens fabrication methodology, including glass design and synthesis, sheet fabrication, preform making, lens molding and surface finishing are presented.
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Daniel Gibson, Shyam Bayya, Jas Sanghera, Vinh Nguyen, Dean Scribner, Velimir Maksimovic, John Gill, Allen Yi, John Deegan, and Blair Unger "Layered chalcogenide glass structures for IR lenses", Proc. SPIE 9070, Infrared Technology and Applications XL, 90702I (1 July 2014); https://doi.org/10.1117/12.2050479
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