Residual Infrared Absorption in As-Grown and Annealed Crystals of Ti:Al2O3

摘要

Data for as-grown and partially oxidized samples of Titanium: Aluminum Oxide grown by the vertical-gradient-freeze technique show that the residual infrared absorption in these samples is largely due to Ti(3+) - Ti(4+) pairs. In agreement with this pair model, the residual absorption in as-grown samples has been substantially decreased by annealing in a reducing atmosphere. Data for an as-grown crystal grown by the heat exchanger method indicate the presence of a second mechanism for residual absorption that may set a lower limit on the ratio of this absorption to the Ti(3+) absorption used to pump laser emission. Reprints. (AW)