How would they manage that? I mean, the only two ways to bend light (and thus the only way to merge beams) are refraction and gravitational lensing. Refraction reduces the light's frequency, introducing issues of ensuring every beam is the same wavelength. Gravitational lensing requires planet-sized masses at the very least, and to merge beams with it would require several precisely arranged. Both methods have timing issues: how do you make sure each beam is precisely in step to avoid interference? I can't help but think that it would be far easier to just build a single ginormous laser.
*A few moments later*: Having read the article, I can't help but think they're actually going to focus ten very powerful lasers on the same point, and this whole "super laser" thing is a PR deal. It should achieve the same result. (Which in my poorly-informed opinion won't be anything spectacular. Pair production from photon-photon annihilation isn't anything new, and reading through the enthusiasm, that's exactly what they're trying to make happen.)
*A few moments later*: Having read the article, I can't help but think they're actually going to focus ten very powerful lasers on the same point, and this whole "super laser" thing is a PR deal. It should achieve the same result. (Which in my poorly-informed opinion won't be anything spectacular. Pair production from photon-photon annihilation isn't anything new, and reading through the enthusiasm, that's exactly what they're trying to make happen.)