NASA has been working on demonstrations of laser communication with satellites. The motivation is simple, in that lasers see less power loss because they spread over a smaller angle. That raises the question, what is the angle over which they spread?
Going by laser physics fundamentals, it seems that for our purposes any Gaussian beam can be effectively taken to be waist-less. By that I mean, the area of the beam at the target distance will be literally the solid angle time the distance.
There is some information on the Lunar Lasercom Ground Terminal (LLGT) (archived page, link isn't working due to govt shutdown?), but none of these specs relate to the divergence angle. Laser pointers you can buy in stores can be 1-3 mrad, which sounds small, but it's really not. Such a beam is literally half the diameter of the moon. A tighter beam introduces a tradeoff where it gets harder to aim, but preserves more of the beam intensity. I'm interested to know where, along that spectrum, modern space laser communications fall.