Optical Coherence describes the degree of correlation between electromagnetic waves at different points in space and time. It determines the ability of light waves to produce stable interference patterns. Temporal coherence relates to the spectral purity of light, while spatial coherence describes phase uniformity across a wavefront. Optical coherence is essential for interferometry, holography, and laser applications. Lasers exhibit high coherence, enabling precise measurements and high-resolution imaging. Coherence also plays a key role in optical communication and quantum optics. Partial coherence is important in understanding natural light sources. Measuring and controlling coherence enables advanced optical diagnostics and sensing techniques. Optical coherence is a fundamental concept linking wave optics with practical optical technologies.
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