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25 October 2000 Dehydroxylation of phosphate laser glass
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Rates of dehydroxylation of two Nd-doped metaphosphate laser glasses (LG-770 and LHG-8) are measured and modeled. Glass melts ranging in size from 100 g to 2.8 kg were bubbled with O2 containing various H2O partial pressures (PH(subscript 2O)) and with O2/Cl2 mixtures at temperatures ranging from 925 - 1300 degree(s)C. The OH content in the glass was measured by monitoring the OH absorption at 3.333 micrometers at various bubbling times. The OH removal by inert gas bubbling (e.g. O2 bubbling) is governed by the transport (diffusion) of OH to the glass liquid/vapor interface and by the chemical equilibrium between OH at the surface and H2O in the gas phase. The equilibrium OH content in glass melts bubbled with O2 containing different PH(subscript 2O) varies as PH(subscript 2O)1/2.
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C. B. Thorsness, Tayyab I. Suratwala, Rusty A. Steele, Jack H. Campbell, Joseph S. Hayden, S. A. Pucilowski, and Koji Suzuki "Dehydroxylation of phosphate laser glass", Proc. SPIE 4102, Inorganic Optical Materials II, (25 October 2000);

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