Selective laser spectroscopy of RE 3+ and Mn 4+ in sol-gel technique produced Al 2O 3

Abstract

Sol-gel produced nanocrystalline highly porous transparent γ-Al 2O 3doped with RE and TM ions and α-Al 2O 3 ceramics, produced by its annealing, were studied with selective laser spectroscopy techniques. The site-selective spectroscopy of RE 3+ ions in α-Al 2O 3 reveals that these ions form centers in corundum with one dominating type. The FLN studies of homogeneous line widths of 5D 0- 7F 0.1 transition in γ- and α-Al 2O 3 extend the low-temperature hole-burning data (Feofilov et al., Phys. Rev. B 54 (1996) 3690). It is shown that Mn 4+ -doped Al 2O 3 is potentially effective photochemical hole-burning material and self-gated persistent hole-burning in α-Al 2O 3: Mn was demonstrated.