NEW HIGH TEMPERATURE INFRARED TRANSMITTING GLASSES.
Semiannual technical summary rept. no. 1, 1 May-31 Oct 62.
TEXAS INSTRUMENTS INC DALLAS
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The glass forming compositions of the siliconantimony-sulfur and silicon-antimony-selenium systems were established. Glasses of the SiSb-S system had high softening points but were rapidly attacked by the atmosphere and showed little or no IR transmission. The Si-Sb-Se glasses were much more resistant to atmospheric attack, had high softening points up to 500 C and good IR transmission. However, absorption bands were found at 9.5 and 12 microns, right in the middle of the desired 8-14 micron region. From reflectivity measurements, the index of refraction of the Si-Sb-Se glasses was found to vary from 2 to 3.5, depending upon composition. No glass composition was found in these two systems that could be used as a high temperature window material for the 8-14 micron atmospheric window. The next system that will be studied will be a phosphorous glass of either silicon or germanium. Author