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A nice, easy to read, article on the history of cooling things with lasers.

"Although using energy to cool something is, of course, routine – it’s what happens in your refrigerator – there is something about the idea of using nothing but light to cool a gas of particles to temperatures a fraction of a degree above absolute zero that makes even experienced physicists scratch their heads."

https://physicsworld.com/a/cold-how-physicists-learned-to-manipulate-and-move-particles-with-laser-cooling/