= Coherence length
{wiki=Coherence_length}
Coherence length is a measure of the length over which a coherent wave, such as light or other electromagnetic radiation, maintains a consistent phase relationship. It quantifies the distance over which the wave can be considered to have a uniform phase, meaning that the wave exhibits stable interference patterns. In the context of laser light, which is highly coherent, the coherence length can be quite long, sometimes extending several meters.
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