Source: http://gizmodo.com/scientists-invent-a-laser-that-fires-electrical-charge-1586783382
Researchers at the University of Michigan have just stumbled upon the most important development in laser research since the invention of the semiconductor diode in the 1950s. It promises to create a new class of lasers that use 250 times less energy than today's, and that's not even the craziest part.