A transient 75 G electron paramagnetic resonance (EPR) hydrogen hyperfine doublet was observed for the first time in low-OH content silica optical fibers during isothermal annealing in the temperature range between 250 and 400°C in air. The results are consistent with the diffusion of hydrogen molecules into the glass with subsequent interaction with E' centers to form an intermediate E'/H and, in turn, an EPR-inactive end product. The response of the doublet to trace amounts of hydrogen was used to monitor hydrogen diffusion and the reaction between E' and hydrogen in the glass.
All Science Journal Classification (ASJC) codes
- Physics and Astronomy (miscellaneous)