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Answer:Laser beams are created by exciting a large number of atoms in a lasing medium to a metastable state where they are stable for a relatively long time. With a large enough population of excited atoms one will spontaneously return to its ground state (normal energy level) and emit a photon. If that photon interacts with other excited atoms it will stimulate them to return to ground state and emit photons of the same wavelength and phase as the stimulating photon. If you don't have mirrors at both ends of the lasing medium you don't stimulate all the excited atoms to return to ground state so your output is low. If you put mirrors on the ends of the lasing medium you bounce the photons back and forth enough to release all the energy as coherent monochromatic light. However if you want any of that light to escape the lasing medium so you can zap something with it you need to make one of the mirrors partially reflective so that some of the photons can get out and do some real work. you also need to space the mirrors so that they are separated by an integral number of of the desired wavelength. This will reinforce the desired wavelength while canceling out any other wavelengths so that your beam is monochromatic, that is only one wavelength of light.
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13y ago
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13y ago

when lasers hit a mirror it bounces back with a wider beam it does this because of the UVA rays in the atmosphere which widens the beam according to where your standing in comparison to the mirror

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Q: How do lasers use reflection to produce stronger beams?
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