Okay, can we use it for cooling like in Sundiver by David Brin[0], where people (IIRC) used lasers to keep themselves cool while, as per title, diving their ship into the Sun?

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[0] - https://en.wikipedia.org/wiki/Sundiver

Lasers are often used to cool atoms & molecules to extremely low temperatures[1]. Bose-Einstein condensates are made via laser cooling, and it's commonly used in quantum entanglement experiments since it can get the involved particles closer to absolute zero than other methods.

[1] https://en.wikipedia.org/wiki/Laser_cooling

No, not like that. Sundiver makes a mockery of the second law of thermodynamics.