Wikipedia
Electrolaser
An electrolaser is a type of electroshock weapon that is also a directed-energy weapon. It uses lasers to form an electrically conductive laser-induced plasma channel (LIPC). A fraction of a second later, a powerful electric current is sent down this plasma channel and delivered to the target, thus functioning overall as a large-scale, high energy, long-distance version of the Taser electroshock gun.
Alternating current is sent through a series of step-up transformers, increasing the voltage and decreasing the current. The final voltage may be between 10 and 10 volts. This current is fed into the plasma channel created by the laser beam.