In theory, I think it is possible. The laser light just needs to carry away entropy, which can be achieved by modulating the beam so that it contains informatio

In theory, I think it is possible. The laser light just needs to carry away entropy, which can be achieved by modulating the beam so that it contains information. Of course, you'll deplete your batteries to power the beam, and the laser itself will have inefficiencies. So with current technology, the system would likely generate more heat than it removed. A civilization with really good engineering could probably make it work, though even in that case, it would still use many joules of free (i.e. usable) energy to remove 1 joule of thermal (waste) energy. A much more efficient method of heat removal would just be to have radiating fins. So you're still converting heat into photons, but you lose much less energy in the process, because the photons you're radiating have a higher entropy.