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In terms of optics and excited states, the lifetime is the mean time an electron will remain in its excited state if undisturbed once it has been stimulated into it. After this time it will fall back down to the ground, or another lower state.

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Related Terms: Absorption, Amplified Spontaneous Emission, Amplifier, Emission Spectra, Erbium, Excited State, Excited State Absorption (ESA), Neodymium, Ytterbium