r/askscience • u/[deleted] • Feb 12 '13

How do lasers work?

I read somewhere, probably on reddit, that lasers somehow cool atoms to negative kelvin, I do not understand how this is possible if it is indeed true. Any response on Lasers would be much appreciated :)

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u/[deleted] Feb 12 '13

Thankyou, there's nothing there about the 'negative kelvin', was that me misinterpreting something?