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5. Real emission lines
5.1 Wave trains and coherence length
The notion of coherence length can be approached in a very pragmatic fashion by considering that, for an ideal transition, the light emitted during a transition consists of a wave train of finite duration τ at a single frequency (figure 1 ). Two wave trains of this type, shifted by a time interval Δ t , can interfere if Δ t < τ ...
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Real emission lines
Role of the optical cavity
