About: Dark state

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In atomic physics, a dark state refers to a state of an atom or molecule that cannot absorb (or emit) photons. All atoms and molecules are described by quantum states; different states can have different energies and a system can make a transition from one energy level to another by emitting or absorbing one or more photons. However, not all transitions between arbitrary states are allowed. A state that cannot absorb an incident photon is called a dark state. This can occur in experiments using laser light to induce transitions between energy levels, when atoms can spontaneously decay into a state that is not coupled to any other level by the laser light, preventing the atom from absorbing or emitting light from that state.

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  • Ein Dunkelzustand ist in der Physik ein Energieniveau eines Atoms oder Moleküls, das bei bestimmten Anwendungen in der Laserspektroskopie, wie bspw. der Laserkühlung, unerwünscht ist. Diese Zustände werden als dunkel bezeichnet, weil die Atome, die sich in diesem Zustand befinden, für die gewünschte Anwendung „unsichtbar“ werden. Es gibt jedoch Ausnahmen, bei denen die Existenz von Dunkelzuständen explizit genutzt wird (z. B. bei bestimmten Bauformen von Atomuhren), jedoch wird dann meist nicht mehr von Dunkelzuständen gesprochen. (de)
  • In atomic physics, a dark state refers to a state of an atom or molecule that cannot absorb (or emit) photons. All atoms and molecules are described by quantum states; different states can have different energies and a system can make a transition from one energy level to another by emitting or absorbing one or more photons. However, not all transitions between arbitrary states are allowed. A state that cannot absorb an incident photon is called a dark state. This can occur in experiments using laser light to induce transitions between energy levels, when atoms can spontaneously decay into a state that is not coupled to any other level by the laser light, preventing the atom from absorbing or emitting light from that state. A dark state can also be the result of quantum interference in a three-level system, when an atom is in a coherent superposition of two states, both of which are coupled by lasers at the right frequency to a third state. With the system in a particular superposition of the two states, the system can be made dark to both lasers as the probability of absorbing a photon goes to 0. (en)
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  • Ein Dunkelzustand ist in der Physik ein Energieniveau eines Atoms oder Moleküls, das bei bestimmten Anwendungen in der Laserspektroskopie, wie bspw. der Laserkühlung, unerwünscht ist. Diese Zustände werden als dunkel bezeichnet, weil die Atome, die sich in diesem Zustand befinden, für die gewünschte Anwendung „unsichtbar“ werden. Es gibt jedoch Ausnahmen, bei denen die Existenz von Dunkelzuständen explizit genutzt wird (z. B. bei bestimmten Bauformen von Atomuhren), jedoch wird dann meist nicht mehr von Dunkelzuständen gesprochen. (de)
  • In atomic physics, a dark state refers to a state of an atom or molecule that cannot absorb (or emit) photons. All atoms and molecules are described by quantum states; different states can have different energies and a system can make a transition from one energy level to another by emitting or absorbing one or more photons. However, not all transitions between arbitrary states are allowed. A state that cannot absorb an incident photon is called a dark state. This can occur in experiments using laser light to induce transitions between energy levels, when atoms can spontaneously decay into a state that is not coupled to any other level by the laser light, preventing the atom from absorbing or emitting light from that state. (en)
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  • Dunkelzustand (de)
  • Dark state (en)
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