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Old 4th March 2015, 08:15 PM   #51
mike3
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Join Date: Aug 2009
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Originally Posted by wogoga View Post
Sunlight should indeed be incoherent, because sunlight emerges from thermal radiation, and thermal radiation is considered spontaneous emission. So the phase of one photon should be independent from all other photons.

However photons, as social particles, tend to emerge and travel in coherent groups. And the longer they travel next to one another, the more they become coherent, by exchanging momentum and energy.
Did you see what was said? The hypothesis that photons interact, or are "social" as you put them, to any great degree has been falsified. They are, for the most part, loners. If they emerged in coherent groups all the time, LASERs would not be necessary to get coherent light beams.
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Last edited by mike3; 4th March 2015 at 08:16 PM.
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