Join Tom and Scott as they discuss this: YouTube user magx1 builds a lot of home-made gas lasers, running electric current through sealed tubes filled with various gases. When you do that, you get the gas atoms all riled up and their electrons absorb energy. Eventually, that energy gets released in the form of directional, highly focused light—a laser. There’s a bit more to it than that, but you’ve got the idea.
And, we get a great reader submission to boot!
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