IR Transmitting Aspheric Window Optics from Spinel Ceramics
MER plans to produce 12"diameter hyper-hemispherical domes and 10"diameter aspheric lenses of transparent spinel for the optic purposes during this program. Spinel was chosen because of its properties such as high transmission in the UV-Vis and Mid-IR wavelength range of 0.2 5.5µm, it is very resistant to abrasion, with density higher than 99.95% of theoretical, with very fine and uniform grain size exhibiting an average flexural strength close to 200+ MPa. MER"s novel and proprietary process consisting of freeze forging, hot pressing and hot isostatic pressing creates close to net shape blank of from which a final part can be render and polished. The final polished part shows low birefringence, high transmission and refractive index homogeneity better than 10 ppm over a 160 degree aperture. To perform this program MER will design and develop all the tooling required to produce 12"diameter hyper-hemispherical domes and 10"diameter aspheric lenses, perform the sintering process and deliver finished optically polished parts to the program manager.
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Materials & Electrochemical Research (ME
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