- #1
coke
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hi, can anyone kindly explain to me what's 'coherent time' and 'duration of wave packet (photon)' in white light interference ?
A wave packet refers to a localized group of waves that travel together as a single unit.
A photon is a fundamental particle of light and other forms of electromagnetic radiation. It carries energy and behaves both as a particle and a wave.
The duration of a wave packet is a measure of how long the wave packet exists before it spreads out and dissipates. It is typically expressed in terms of the time it takes for the packet to spread to twice its original size.
Coherent time refers to the duration of time during which a wave packet maintains its coherence, meaning the waves within the packet remain in phase with each other. This is important for the transmission and detection of information.
The duration of a wave packet and its coherent time are inversely related. This means that as the duration of a wave packet increases, its coherent time decreases. This is because as the packet spreads out, the waves within it become more out of phase with each other, leading to a decrease in coherence.