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The definition of coherence is something logical or consistent and something that makes sense as a whole. An example of coherence is an argument that has no inconsistencies. coherence. coherence. The quality or state of cohering, especially a logical, orderly, and aesthetically consistent relationship of parts.
How to cite the article; suggest additional literature. Coherence is one of the most important concepts in optics and is strongly related to the ability of light to exhibit interference effects. A light field is called coherent when there is a fixed phase relationship between the electric field values at different locations or at different times. Partial coherence means that there is some (although not perfect) correlation between phase values.