This is good development and I laud the developers, but this still isn't viable against manned aircraft. It's a popular misconception that as soon as a laser touches something it "instantly" explodes. It doesn't work like that. It has to stay on target for a period of time in order to super-heat the target. In the video, the laser is held in position for about seven seconds on the drone while flying straight and level.  
  
A manned aircraft would never let that happen. The pilot, if he wasn't already maneuvering, would feel the heat and pull some violent evasions to get away from the beam.  
  
When the developers can get the beam so powerful it only needs to be held on target for ONE second, instead of the current seven, then you'll have something really dangerous.