Non-Radiative Decay

A rare-earth ion in an upper excitation state (reached by absorption of a high energy pump photon) can relax to a slightly lower state with the release of a small amount of vibrational energy, a phonon, before decaying fully to the ground state (with the emission of a lower energy signal photon). This process is known as non-radiative decay.

 

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Related Terms: Absorption, Active Medium, Erbium Doped Fiber (EDF), Neodymium, Ytterbium