Chalcogenide Glasses for Infrared Optics by A. Ray Hilton

By A. Ray Hilton

State-of-the-art ideas for yielding fine quality chalcogenide glasses This pioneering paintings describes the know-how, built over a 50-year interval, to make use of chalcogenide glasses as infrared optical fabrics. equipment for qualitatively making a choice on chalcogenide glass compositions and generating high-purity homogeneous glass are mentioned. Chalcogenide Glasses for Infrared Optics comprises distinct creation recommendations built during the author's paintings at either Texas tools (TI) and Amorphous fabrics, Inc. (AMI). The creation of vacuum glide zoned silicon, gallium arsenide, and cadmium telluride, all helpful in infrared expertise, is defined. The e-book highlights examples of ways glass composition may be replaced to reinforce a selected estate. assurance comprises: Transmission of sunshine by means of solids actual houses of chalcogenide glasses Glass creation cautious characterization of glass houses traditional lens fabrication--spherical surfaces Molding of unconventional aspheric lenses with diffractive surfaces Glass strategies for different functions IR imaging bundles made up of chalcogenide glass fibers construction of infrared crystalline fabrics at AMI improvement of an automated ellipsometer method at TI

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The Army embraced a common module approach whereby different companies could all build from the same design. There would be three programs: the ANTAS for the Infantry, the Tank Thermal Sight, and TADS PNVS for the helicopter. All companies could compete, and the winner’s design would be adopted as the common module. Since the wavelength range was wide, color correction would be necessary which meant that a second optical material would be needed to go along with germanium, by then the industry standard.

6. The percent reflections for As2S3 glass, Ge2S3 glass, a Si-As-Te glass, and a Ge-P-Te glass, all measured in the far infrared using the Perkin Elmer 301 infrared spectrophotometer at TI, are shown. Note the percent reflection for these glasses is much smaller than that shown by glassy quartz. The fundamental frequencies for the As—S bond, the Ge—S bond, the Si—Te bond and the Ge—Te bond in the glasses are all near the peak of their respective reflections. Their long wavelength cutoff then is about one-half the wavelength of their peaks.

The glass forming composition region is designated to lie within the dashed lines. Again, note that the extent of this region is dependent on the quenching procedure as well as the composition. For example, quenching in a cool liquid would enlarge the area. The evaluation results indicated a system that was not promising. 13 Comparison of the sizes of glass forming regions indicates differences in the glass forming tendencies of different element combinations. 33 Efforts to form glasses with Sn were unsuccessful except in very low Sn concentrations.

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