Really you still shouldn't see any visible beams in a vacuum like space, whether or not the laser is firing at a wavelength in the visible spectrum.
My space opera suggestion above is that they've come up with a way to make lasers visible in space akin to how tracer ammunition was developed for slug throwers. If lasers need atmospheric particles in which to see lasers, then maybe the laser photon has been manipulated so that it sheds excess particles of X, and the photon behind that one interacts with it as normal lasers in atmoshere.
Or, whatever. It's a handwave.
