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Electromagnetically induced transparency (EIT) is a coherent optical nonlinearity which renders a medium transparent within a narrow spectral range around an absorption line. Extreme dispersion is also created within this transparency "window" which leads to "slow light", described below. It is in essence a quantum interference effect that permits the propagation of light through an otherwise opaque atomic medium. EIT is based on the destructive interference of the transition probability amplitude between atomic states. Closely related to EIT are coherent population trapping (CPT) phenomena.

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  • La transparència induïda electromagnèticament (acrònim anglès EIT) és una no linealitat òptica coherent que fa que un medi sigui transparent dins d'un rang espectral estret al voltant d'una línia d'absorció. També es crea una dispersió extrema dins d'aquesta "finestra" de transparència que condueix a la " ", que es descriu a continuació. Es tracta, en essència, d'un efecte d'interferència quàntica que permet la propagació de la llum a través d'un medi atòmic opac. L'observació d'EIT implica dos camps òptics (fonts de llum altament coherents, com ara els làsers) que estan ajustats per interactuar amb tres estats quàntics d'un material. El camp "sonda" està ajustat a prop de la ressonància entre dos dels estats i mesura l' espectre d'absorció de la transició. Un camp d'acoblament" molt més fort s'afina prop de la ressonància en una transició diferent. Si els estats se seleccionen correctament, la presència del camp d'acoblament crearà una "finestra" espectral de transparència que serà detectada per la sonda. El làser d'acoblament de vegades es coneix com a "control" o "bomba", aquest darrer en analogia amb les no linealitats òptiques incoherents com la . Aplicacions: procés d', tecnologia d' (ca)
  • Electromagnetically induced transparency (EIT) is a coherent optical nonlinearity which renders a medium transparent within a narrow spectral range around an absorption line. Extreme dispersion is also created within this transparency "window" which leads to "slow light", described below. It is in essence a quantum interference effect that permits the propagation of light through an otherwise opaque atomic medium. Observation of EIT involves two optical fields (highly coherent light sources, such as lasers) which are tuned to interact with three quantum states of a material. The "probe" field is tuned near resonance between two of the states and measures the absorption spectrum of the transition. A much stronger "coupling" field is tuned near resonance at a different transition. If the states are selected properly, the presence of the coupling field will create a spectral "window" of transparency which will be detected by the probe. The coupling laser is sometimes referred to as the "control" or "pump", the latter in analogy to incoherent optical nonlinearities such as spectral hole burning or saturation. EIT is based on the destructive interference of the transition probability amplitude between atomic states. Closely related to EIT are coherent population trapping (CPT) phenomena. The quantum interference in EIT can be exploited to laser cool atomic particles, even down to the quantum mechanical ground state of motion. This was used in 2015 to directly image individual atoms trapped in an optical lattice. (en)
  • La transparence induite électromagnétiquement (TIE) est une non-linéarité optique cohérente qui rend un milieu transparent dans une bande spectrale étroite au sein d'une raie d'absorption. Une dispersion extrême est aussi créée dans cette "fenêtre" transparente qui permet de "ralentir la lumière". L'observation de la TIE nécessite deux faisceaux optiques (venant de sources hautement cohérentes, telles que des lasers) qui sont ajustés de manière à interagir avec trois états quantiques du matériau. Le faisceau "sonde" est réglé pour être proche de la résonance entre deux des états et mesure le spectre d'absorption de la transition. Un faisceau "pompe" bien plus puissant est ajusté pour être proche de la résonance de l'autre transition. Si les états sont sélectionnés proprement, la présence du faisceau de couplage crée une "fenêtre" spectrale de transparence qui est détectée par la sonde. La TIE est basée sur l'interférence destructive des amplitudes de probabilité des transitions entre états atomiques. (fr)
  • La trasparenza elettromagneticamente indotta (Electromagnetically induced transparency, EIT) è un fenomeno ottico che consiste nel rendere un mezzo trasparente in certo intervallo di frequenze nell'intorno di una linea di assorbimento. All'interno di questa "finestra" di trasparenza si crea inoltre una estrema dispersione, che rallenta sensibilmente la velocità di gruppo della luce. Per osservare questo fenomeno è necessario accoppiare due raggi laser (due fasci coerenti di luce) con tre livelli energetici del mezzo. Uno dei due fasci di luce, il probe field, deve avere la stessa energia della transizione tra due livelli energetici (dei tre considerati) del mezzo e misura lo spettro di assorbimento della transizione. L'altro, il coupling field, deve essere molto più intenso e deve avere l'energia della transizione tra altri due livelli (sempre all'interno dei tre livelli considerati). Se i tre stati sono scelti in maniera appropriata, la presenza del coupling field crea una finestra di trasparenza nelle righe spettrali del mezzo, proprio in corrispondenza del probe field. Questo meccanismo è basato sull'interferenza quantistica tra le probabilità di transizione dei livelli energetici del mezzo. (it)
  • 電磁波引發透明(英語:Electromagnetically induced transparency,EIT),一般是用两束光同时照射到原子介质(如大量原子组成的气体),使得其中一束光能够在与原子跃迁共振时通过原子介质而不产生吸收和反射的现象。 Rb原子"梯子"能级图: |3> nS1/2 | | 480nm 耦合光 | |2> 5P3/2 | | 780nm 探测光 | |1> 5S1/2 观测 EIT 需要两种相干光源(例如 激光)和介质(一般为原子气体,如Rb85,Rb87)的三种 量子态. 两种相干光源分别称为"探测光"和"耦合光",通常耦合光数十倍强于探测光。置"耦合光"频率恰等于|2>和|3>能级差,调节"探测光"的频率于|1>和|2>能级差的数倍左右. EIT 是基于跃迁光在原子能级之间破坏性的相干,和 (CPT) 现象紧密相连. (zh)
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  • 電磁波引發透明(英語:Electromagnetically induced transparency,EIT),一般是用两束光同时照射到原子介质(如大量原子组成的气体),使得其中一束光能够在与原子跃迁共振时通过原子介质而不产生吸收和反射的现象。 Rb原子"梯子"能级图: |3> nS1/2 | | 480nm 耦合光 | |2> 5P3/2 | | 780nm 探测光 | |1> 5S1/2 观测 EIT 需要两种相干光源(例如 激光)和介质(一般为原子气体,如Rb85,Rb87)的三种 量子态. 两种相干光源分别称为"探测光"和"耦合光",通常耦合光数十倍强于探测光。置"耦合光"频率恰等于|2>和|3>能级差,调节"探测光"的频率于|1>和|2>能级差的数倍左右. EIT 是基于跃迁光在原子能级之间破坏性的相干,和 (CPT) 现象紧密相连. (zh)
  • Electromagnetically induced transparency (EIT) is a coherent optical nonlinearity which renders a medium transparent within a narrow spectral range around an absorption line. Extreme dispersion is also created within this transparency "window" which leads to "slow light", described below. It is in essence a quantum interference effect that permits the propagation of light through an otherwise opaque atomic medium. EIT is based on the destructive interference of the transition probability amplitude between atomic states. Closely related to EIT are coherent population trapping (CPT) phenomena. (en)
  • La transparence induite électromagnétiquement (TIE) est une non-linéarité optique cohérente qui rend un milieu transparent dans une bande spectrale étroite au sein d'une raie d'absorption. Une dispersion extrême est aussi créée dans cette "fenêtre" transparente qui permet de "ralentir la lumière". La TIE est basée sur l'interférence destructive des amplitudes de probabilité des transitions entre états atomiques. (fr)
  • La trasparenza elettromagneticamente indotta (Electromagnetically induced transparency, EIT) è un fenomeno ottico che consiste nel rendere un mezzo trasparente in certo intervallo di frequenze nell'intorno di una linea di assorbimento. All'interno di questa "finestra" di trasparenza si crea inoltre una estrema dispersione, che rallenta sensibilmente la velocità di gruppo della luce. Questo meccanismo è basato sull'interferenza quantistica tra le probabilità di transizione dei livelli energetici del mezzo. (it)
rdfs:label
  • Transparència induïda electromagnèticament (ca)
  • Electromagnetically induced transparency (en)
  • Transparence induite électromagnétiquement (fr)
  • Trasparenza elettromagneticamente indotta (it)
  • 电磁感应透明 (zh)
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