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 108 and 109 volts. This current is fed into the plasma channel created by the laser beam.
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Examples of Electrolasers
Applied Energetics / Ionatron
Publicly traded company Applied Energetics (formerly Ionatron) develops directed-energy weapons for the United States Military. The company has produced a device called the Joint IEDzer (JIN) which was deemed unfit for field use in 2006. The JIN is intended for safely detonating improvised explosive devices (IEDs). Future designs include weapons mounted on land, air and sea vehicles and as a hand-held infantry version.
Applied Energetics said that the weapons will be able to be used as a non-lethal alternative to current weaponry, but will be able to deliver a high enough voltage jolt to kill.
Applied Energetics / Ionatron say that they are working on an electrolaser system, called LGE (Laser Guided Energy). They are also studying a laser-induced plasma channel (LIPC) as a way to stop people from going through a corridor or passageway.
There was an unconfirmed report that in 1985 the U.S. Navy tested an electrolaser. Its targets were missiles and aircraft. This device was known as the Phoenix project within the Strategic Defense Initiative research program. It was first proved by experiment at long range in 1985, but this report may have referred to an early test of MIRACL, which is or was a high-powered chemical laser.
HSV Technologies, Inc. (Stood for the last names of the original founders, Herr, Schlesinger and Vernon; this is NOT the same company as Holden Special Vehicles), formerly of San Diego, California, USA, then Port Orchard, WA, designed a non-lethal device which was profiled in the 2002 TIME magazine article “Beyond the Rubber Bullet”. It is an electrolaser using ultraviolet laser beams of 193 nm, and promises to immobilize living targets at a distance without contact. There is plan for an engine-disabling variation for use against the electronic ignitions of cars using a 248 nm laser. The lead inventor, Eric Herr, died in 2008 and the company appears to have been dissolved, as their website now hosts an unrelated business (as of 9/2015) 
Scientists and engineers from Picatinny Arsenal have demonstrated that an electric discharge can go through a laser beam. The laser beam is self-focusing due to the high laser intensity of 50 gigawatts, which changes the speed of light in air. The laser was reportedly successfully tested in January 2012.
Also visit the Non-Legal Weapons Handbook