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26 December 1984 Oxide Glasses With Superior Infrared Transmission
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The glass-forming areas of two new systems based on the oxides of lead, gallium, and bismuth and cadmium, gallium, and bismuth have been mapped out. These glasses can be melted at 1000°C for 20 minutes and cast into homogeneous pieces at least as large as 30 mm X 30 mm X 15 mm. Their expansion coefficients (25°C-200°C) range from 83 X 10-7/°C to 112 X 10-7/°C, and they are relatively soft with Knoop hardness (100g) in the 225 region. The refractive index (ND) is in the vicinity of 2.4. The lower absorption edge is about 470 nm (yellow color) but they transmit out to 81m in 2 mm thickness. This is the best infrared transmission for any oxide glass which is sufficiently stable to devitrificationon cooling from the melt to enable sizeable pieces to be formed.
© (1984) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
William H. Dumbaugh "Oxide Glasses With Superior Infrared Transmission", Proc. SPIE 0505, Advances in Optical Materials, (26 December 1984);


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