A Laser Detector is a security device. It is designed to alert nearby guards if something crosses the beam.
The laser detector is connected to a generator and if the generator is shut down or destroyed, then all connected laser detectors cease operation.
It is therefore less of a weapon and more of a security alert system meant to help alert RDA personnel of any breach in an RDA-held territory.
Source[]
- James Cameron's Avatar: The Game (Wii/PSP) Ingame tutorials