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22 May 2015 Temperature dependent behavior of optical loss from hydrogen species in optical fibers
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This study reports on the temperature dependent behavior of absorption bands generated in optical fibers via hydrogen exposure at 800 °C. Hydrogen exposure at 800 °C resulted in the generation of two large absorption bands in the 1-2.5 μm wavelength range at ~1.4 μm and ~2.2 μm. These bands showed temperature dependent behavior when in the temperature range of 20–800 °C such that at higher temperatures the absorption intensity in these two bands was smaller than at room temperature. The temperature dependent behavior was shown to be reversible and repeatable under an array of testing conditions including thermal cycling and long periods of time without hydrogen exposure. The reversibility suggests that no chemical change is taking place while the repeatability suggests that no permanent structural change in the glass is taking place. Although both absorption bands are associated with hydroxyl groups and exhibited similar temperature dependence, variations were observed with respect to time and exposure environment. Therefore, we surmised that the observed behaviors were not exclusive to the hydroxyl bond and/or structural modifications. In this paper, we discuss the possible mechanisms responsible for the observed phenomena and, conversely, the conditions that would be necessary to induce the structural changes that would induce changes in the absorption intensities.
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Elizabeth Bonnell, Li Yu, Dan Homa, Gary Pickrell, and Anbo Wang "Temperature dependent behavior of optical loss from hydrogen species in optical fibers", Proc. SPIE 9467, Micro- and Nanotechnology Sensors, Systems, and Applications VII, 94671L (22 May 2015);

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