UAV technology

Defending against one drone isn't a problem. But if there are multiple drones, then sending a million dollar interceptor missiles becomes very expensive tradeoff because drones are very cheap.

The US Navy has several Laser Weapon system (LWS) being developed and tested. LWSs are cheap to fire but expensive to build.

But once its built, then it can keep firing, like a few dollars per shot.

Each drone type has different characteristics and the LWS aim points are the locations where that particular drone is most vulnerable to incoming laser fire.

The operator looks at the drone's image on the screen to determine where to point the LWS and then fires the laser beam.

The more powerful the laser, the more energy it delivers in a given time. To heat a drone enough to cause catastrophic damage, the laser must be firing the entire time. But there's a catch, the laser beam must be continually held at the same spot. If the drone continuously moves, then laser beam will wander along its surface, if not continuously re aimed. In this case, the laser's energy will be distributed across a large area instead of concentrated at a single point. This process continuously firing the laser beam at one spot is called aimpoint maintenance.