With a big enough laser and a big enough collecting device for a reflected signal, I can imagine that communication even at such distances is possible. On the o

With a big enough laser and a big enough collecting device for a reflected signal, I can imagine that communication even at such distances is possible. On the other hand I can't understand the propulsion mechanism. The acceleration is such that any device will simply be ripped apart by the immense forces. The "sail" must be both impossibly thin to even allow such high acceleration but also impossibly strong to transfer all that force to the craft itself, and if that's not enough it needs to be impossibly reflective so that the laser doesn't vaporise it instead of accelerating it. I can't see how anyone could think the concept could ever possibly work.