![]() Spatial coherence can be defined as the cross-correlation between two points in a wave for all times. We need to be careful in order to avoid any confusion between the coherence time with the time duration of the signal and also the coherence length with the area of coherence. This can be described as the distance to which the wave travels in the time period of Tc. Moreover, another important term is coherence length, abbreviated as Lc. However, it tends to drop significantly when the delay passes T = Tc. The delay of this wave over which the phase or the amplitude can wander by a significant amount is named as the coherence time or “Tc.”įigure 01: The Amplitude of a Wave (considering a single frequency as a function of time “t”)įurther, when the delay is at the state T = 0, the degree of coherence becomes perfect. In other words, it describes the way that a wave can interfere with itself for a certain time period. Temporal coherence can be used to describe how monochromatic a source can be. Temporal coherence can be defined as the measure of the average correlation between the value of a wave and itself, delayed by T (time period of oscillation of the wave) at any pair of times. Summary – Temporal vs Spatial Coherence What is Temporal Coherence? ![]() ![]() Temporal vs Spatial Coherence in Tabular Formĥ. Generally, coherence describes the correlation between physical quantities of a single wave or between some waver or wave packets. We can describe the property of coherence as an ideal property of waves that can enable stationary interference. The key difference between temporal and spatial coherence is that temporal coherence describes the correlation between waves that are observed at different moments in time, whereas spatial coherence refers to the correlation between waves at different points in space, which are either lateral or longitudinal.Ĭoherence is an important phenomenon that refers to two wave sources that are coherent if their frequency and waveform are identical. ![]()
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