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Old 4th March 2015, 08:15 PM   #51
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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.
“Ego is subversive and devolutionary, truly destructive and terrible; ego is the generator of privilege, established institutions, and comfortable habit. Ego is the fire that burns within the pit of hell, devouring and consuming everything that enters and leaving utterly nothing behind. Ego is horrible, cruel, and restraining, the darkness of the world, and the doom and bane of man.” – my reaction to that famous Bertrand Russell quote.

Last edited by mike3; 4th March 2015 at 08:16 PM.
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