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A device that produces light of the same wavelength.

Atoms Practice
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A laser is a device that emits a focused, amplified, and specific wavelength of coherent light. What is "laser" an acronym for?

Lasers make use of chemical properties of atoms. Atoms release photons (light) when they get excited. There are three possible ways that the atom can get excited. What are they and which one do lasers take advantage of?

In the first question, it was found that one way atoms can be excited is by having collisions with photons of exactly the right frequency. Einstein wondered what would happen if an already excited atom collided with a photon with the same energy as the one that put the atom in the excited state in the first place. What did he find when he tested his question? What is stimulated emission? 

What are some ways lasers are used today?

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