Can this phenomenon be used as a shield for spacecraft? If a laser travels inside a fiber cable, then the laser beam can wrap around the spacecraft. If the beam can stop electrons, it can potentially stop the larger particles traveling in space.
If you want the laser beam carry enough impulse to stop a rock flying towards you at a few thousands km/h, good luck keeping the fiber in place! Every time the fibre tries to make the light change direction, the light tries to straighten the fibre, just like water running through a pipe.