Before revision: Measurement of temporal coherence 400px|Figure 3: The amplitude of a wavepacket whose amplitude changes significantly in time τc (red) and a copy of the same wave delayed by 2τc (green) plotted as a function of time t. At any particular time the red and green waves are uncorrelated; one oscillates while the other is constant and so there will be no interference at this delay.
After revision: Measurement of temporal coherence 400px|Figure 3: The amplitude of a wavepacket whose amplitude changes significantly in time (red) and a copy of the same wave delayed by (green) plotted as a function of time t. At any particular time the red and green waves are uncorrelated; one oscillates while the other is constant and so there will be no interference at this delay.