But is it in the 40 watt range?

The Military Will Test a New Terrifyingly Loud Noise Gun

In short: it’s a laser that focuses a nanosecond pulse in front of a target to cause the air to superheat into a ball of plasma and go BANG, at 130 decibels. So far the ranges tested have been short; development is needed to given the system useful range of 100 meters.

Expect to see this used not so much by the military, but by militarized police forces looking for a way to knock protestors off their feet.