Silica (pure SiO2) can be doped with aluminium (Al), mostly as alumina (Al2O3), for several reasons. It increases the index of silica, and also helps rare-earth ions find sites in the glass; aiding incorporation and increasing doping concentration. It can also be used in careful combination with other dopants to create tailored profiles in the emission spectra of rare-earth ions.
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Related Terms: Aluminosilicate Glass, Erbium Doped Fiber (EDF), Erbium Doped Fiber Amplifier (EDFA), Erbium, Ytterbium