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Coherence length
In
physics
,
coherence length
is the
propagation
distance over which a
coherent
wave (e.g. an
electromagnetic wave
) maintains a specified
degree of coherence
.
Wave interference
is strong when the paths taken by all of the interfering waves differ by less than the coherence length. A wave with a longer coherence length is closer to a perfect sinusoidal wave. Coherence length is important in
holography
and
telecommunications engineering
.
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