Laser is not _bounced_ radially, is it? (was Laser-bounce radiation-

> > If the radiation is totally reflected, the radiation pressure is doubled."
> The force is directed radially (close enough).

The laser beam is bounced non-radially (forward, orbit-wise), according to your ppt slide diagram. That slows the mirror in its orbit. A possible solution would be to compensate by bouncing the laser beam in the opposite direction half the time, or simultaneously. That would double the electrical power draw, and possibly double the needed power of the laser system (at least in the case of simultaneous compensation).

> a 5t bounce mirror would need to orbit 0.4 km inside GEO to offset the radiation force.

The laser would be forced to operate consistently, for the life of the system, to keep the laser from falling from its compensatory orbital height.