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superradiance
In physics, the term superradiance is used to refer to radiation enhancement effects in several contexts including quantum mechanics, astrophysics and relativity.
==Quantum Optics==
In quantum optics, superradiance is a phenomenon that occurs when a group of N emitters, such as excited atoms, interact with a common light field. If the wavelength of the light is much greater than the separation of the emitters, then the emitters interact with the light in a collective and coherent fashion. This causes the group to emit light as a high intensity pulse (with rate ∝ N2). This is a surprising result, drastically different from the expected exponential decay (with rate ∝ N) of a group of independent atoms (see spontaneous emission). Superradiance has since been demonstrated in a wide variety of physical and chemical systems, such as quantum dot arrays and J-aggregates. The effect has recently been used to produce a superradiant laser.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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