Laser Anti-theft Device

It is Mechanism to detect objects passing the line of sight between the laser source and the detector.

Stronger lasers can be used to injure entities passing the laser beam. In fiction, laser fences may have the ability to stop intruders by blocking or injuring them.

Lasers devices are used to keep birds from eating blueberries by being perceived as a predator.

The European Commission is funding research into a laser fence to scare away rats and other pests