The quest to transmit power without wires has been something people have been working on since centuries and obviously it not science fiction anymore, people have come up with different ways to transmit power wirelessly. We wrote about Wirticity back in 2010 which gained a lot of media attention back then.
Back in 2009 a Seattle-based company by the name 'LaserMotive' specializing in laser power beaming proved to be the only successful entrant and winner of the NASA-sponsored Power Beaming Challenge.
The idea of laser power is pretty simple. Just like a photovoltaic cell (solar cell) produces electricity from sun light, Laser power beaming acts in the same way. A powerful laser beam is used to carry energy over distances; this energy in the form of light and heat can be converted into electricity by using photovoltaic cells. This enables to transfer power wirelessly over distances and can be consider a more practical efficient and cost effective way compared to other wireless power transmission methods available. To get into the details you can check out this Laser power beaming fact sheet.
So now that we know about laser power beaming, the idea can be used for a wide variety of applications, only your imagination is the limit. Although there are a lot of safety and efficiency factors involved with makes it difficult to use over existing electric power grid, we wont get into that in this post. You can always leave a question or opinion in the comments.
Now in the modern warfare era of Drones, UAVs and UAS (unmanned ariel systems), endurance is one of the major challenges faced by UAV designers and developers. Battery based UAVs are silent but poor at endurance. Conventional fuel based UAVs have better endurance but they are very noisy and are difficult to use where you require to fly at low altitudes and small areas. So the application of laser power beaming seems to be the best solution.