Re: 1m/s**2
If after launching the craft, a second craft is then sent along the same trajectory, but purposed to refocussing the laser beam, then a third and a fourth...then the integrity of the beam could be maintained over large distances.
Similarly, the lensing apparatus could be sent ahead of the main payload and then position themselves after the payload has overtaken them, with a couple of twitches from the source laser, and an adept bit of tacking.
Biting the hand that feeds IT
