Dec 1st 2014, 05:44 AM
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#6 |
Senior Member
Join Date: Apr 2008 Location: Bedford, England
Posts: 668
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Going back to the walking people analogy;
"normal" light could be likened to a crowd of people leaving a stadium,
there is a lot of randomness in the individual photon energies, etc...
Coherent laser light would then be like an army marching out of a barracks,
The individual photons are almost identical, and "marching" in phase.
As you indicate, laser light is monochromatic light,
thus a diffaction grating will not produce a spectrum.
If you were to combine the output of several lasers of different colours into a single beam,
then the difracfraction grating would re-separate the different coloured beams.
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