The US Military has an honest-to-God Laser Gun. They call it a battlefield laser system, of course, because Laser Gun sounds lame.
It’s name is ZEUS. The purpose is not to shoot aliens, rather to heat up and explode unexploded ordinance and land mines. But it’s a laser powered weapon, and that’s awesome no matter what it is used for.
And yes, I am several years behind the times. The system was deployed in Afghanistan in 2003, so it’s been around a long time.
Source: Some TV show. But this site here has an entire category dedicated to Lasers and Ray Guns. This will definitely require some follow up research.

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In the book WWZ they used lasers to explode unexploded zombies. It turned out to be slow and inefficient, but it was great for political vidoes showing laser-exploded-zombie-heads!