Investigation of As_(40)Se_(60) chalcogenide glass in precision glass molding for high-volume thermal imaging lenses

摘要

The growing demand for thermal imaging sensors and cameras has focused attention on the need for larger volumes of lower cost optics in this infrared region. A major component of the cost of thermal imaging lenses is the germanium content. As_(40)Se_(60) was developed as a moldable, germanium-free chalcogenide glass that can serve as a low cost alternative to germanium and other infrared materials. This material also has promising characteristics for improved optical performance, especially with regard to reduced thermal sensitivity. As_(40)Se_(60) has found acceptance as a material to be diamond turned or polished, but it is only now emerging as a legitimate candidate for precision glass molding. This paper will review chalcogenide molding and characterize As_(40)Se_(60) for widespread use in high-volume thermal imaging optics. The relative advantages and disadvantages of As_(40)Se_(60) as compared to other chalcogenide glasses will also be discussed.