Fig. 1From: Benefit of Rare-Earth “Smart Doping” and Material Nanostructuring for the Next Generation of Er-Doped Fibers a TEM image of Er 3+ -doped boehmite NPs in the precursor solution. b XRD pattern of Er 3+-doped boehmite with Al/Er = 200. c TEM image of Al2O3:Er 3+ NPs embedded in the optical fiber preform core of the sample NP350Back to article page