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garytse86
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A laser is a device that uses light flashes to excite the atoms so you get electrons with energy levels about 2 or 3 levels above the ground state. They emit photons, which vibrate at a particular frequency, they get reflected off the half silvered mirror, to excite electrons and make them emit pohtons at the same frequency. So the wavelength of the laser is just one, nothing else, but surely an atom has got more than one electron in the outer shell, wouldn't this cause a problem because either the atom would emit photons with different frequencies, because two particles in the same atom cannot be at the same state, according to the exclusion principle.
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