Humanity is getting closer to having laser weaponry. Northrop Grumman announced that they were able to get a laser to fire at 105.5 kilowatts for a sustained amount of time. The power requirements are immense.
This level of power was achieved by using a scalable system. They combined multiple lasers into one high powered beam. Most industrial lasers use a maximum 1.5 kilowatt beam to cut metal with. A weapon of this magnitude could potentially destroy buildings, aircraft and vehicles, not to mention people.