The degree of coherence is a measure of the correlation between the phases of waves at different points in space and/or time. It is an important concept in fields such as optics, wave physics, and signal processing. Coherence can be classified into two main types: 1. **Temporal Coherence**: This refers to the correlation between the phases of a single wave at different points in time. It is associated with the spectral width of a light source.
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