A laser isn't going to work due to too many false positives (birds, litter, small animals) and runways are rarely level (so long beams aren't practical).
Also a laser on a plane would have difficulty knowing the difference between an up slope and another plane. Plus if an obstacle is within visual range, then a pilot can take action anyway.
Your link is to a system that scares birds using fairly low intensity beams of light. It doesn't have an aiming or detection system built in.