= Coherence theory (optics)
{wiki=Coherence_theory_(optics)}
Coherence theory in optics refers to the characteristics of light waves, particularly in terms of their phase relationships. It is a crucial concept in understanding the behavior of light, especially in applications such as interferometry, holography, and various optical technologies. **Key Aspects of Coherence Theory:** 1. **Coherence Length and Time:** - Coherence length is the distance over which a coherent wave (like a laser beam) maintains a predictable phase relationship.
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