Yes perpetual motion is possible in space. HOWEVER, once you connect the moving device to a load (in this case the laser/light emitting device) it will slow down and stop.
Even in space perpetual motion is not possible.
You are still hit by light rays and micro particles, even if they are rare.
Yes it would take VERY long time to slow you down (or accelerate you further more) but your motion would not be stable nor perpetual.
here a comment from your idea but in real stuff moving around : satellites
"A satellite can spin for quite a long time since the kinetic energy of it doesn't decrease significantly (it doesn't mean that the energy doesn't decrease at all - it does, and for that reason a satellite will fall down eventually).
Now if we're going to harvest any energy with the aim of having a "profit", we would just "drain" it's kinetic energy, its speed will decrease at a greater rate, hence the satellite will fall noticeably sooner which would make the benefit of launching the satellite way less than the proposed benefit."
If we would somehow manage to create perpetuum mobile, I would be 100% certain we indeed are in a simulation, because that would defy all the laws of physics, and I would be sure someone just entered cheat codes into our simulation. Am not even joking.
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