Pair Induced Quenching (PIQ)
In highly doped rare-earth glasses the ions can end up so close to each other that, rather than emitting and absorbing energy from the core glass, they start to pass energy between themselves; this effectively removes them from externally observed energy transfer processes and is almost as if they were not in the glass – reducing the effective doping concentration. This effect can occur when two ions are co-located, and is know as pair-induced quenching, or PIQ.
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Related Terms: Absorption, Doping Density, Erbium, Erbium Doped Fiber (EDF), Neodymium, Pair Induced Quenching (PIQ), Ytterbium