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Coherent
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==Key Stage 5==
===Meaning===
Two sources of waves are [[coherent]] if they [[emit waves ]] [[wave]]s with a constant [[Phase Difference|phase difference]].
===About Coherence===
*'''Coherent ''' sources produce waves [[wave]]s that are in sync, having a constant [[phase ]] relationship. *Necessary '''Coherence is necessary for producing clear [[Interference Pattern|interference patterns]]. *'''Coherent waves ''' [[Visible Light|visible light]] are typically [[monochromatic ]] and have the same [[frequency]]. *Essential '''Coherence''' is essential in applications like lasers[[laser]]s, holography, and [[interferometry]]. *'''Coherence ''' can be temporal (constant phase difference over time) or spatial (constant phase difference across space). *The degree of '''coherence ''' affects the visibility and contrast of [[Interference Fringe|interference fringes]]. *Achieving '''coherence ''' often involves stabilizing the [[frequency ]] and [[phase ]] of the [[wave ]] sources.
===Examples===
*[[Laser]] light is '''coherent''' and can produce clear [[Interference Pattern|interference]] and [[Diffraction Pattern|diffraction patterns]].