P

The deliberate introduction of energy into a system is referred to as pumping. This is most relevant to systems where energy at short wavelength is pumped into an active medium to excite it to emit light at a longer wavelength. This may produce highly coherent light in a laser, introduce gain into a signal in an amplifier, or produce a broadband output from an ASE source.

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Related Terms: Absorption, Co-Propagating Pump, Counter-Propagating Pump, Erbium Doped Fiber (EDF), Erbium Doped Fiber Amplifier (EDFA), Neodymium, Pumping, Ytterbium