Proceedings PaperDevelopment Of 8 - 14 Micron Infrared Transmitting Fiber Optics
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This paper reports recent work in infra-red fiber optics capable of transmitting over the spectral range 8 to 14 microns using glasses composed of As, Se, Te and S. The external transmittance of 1-inch long fiber bundles averages 40 percent in the 2 to 12 micron wavelength region. This transmission includes losses due to end reflection and packing fraction, but the end reflections may be reduced using anti-reflection coatings. It is predicted that the transmission would be increased to 70 percent in the 8 to 12 micron region. Beyond 12 microns the fiber bundles become almost opaque due to the oxide impurities in the glass. The 3 to 4 mil diameter infra-red fibers will bend over a 1/16 inch radius and will support at least 50 grams weight. Improved infrared fibers should be attained by using the new Ge-As-Se glasses and a vitreous carbon concentric crucible system.