Although it is not completely handheld, this is technically a portable 20W laser. I don't know what wavelength it is, but it looks to be ~405nm or shorter (ultraviolet).
I did see a video once where a 300mW laser was cleaning oil on a drive way. This just seems like it took it to the next step. The thing looks like it's an array, and nothing other than a big enough battery pack and some sufficient cooling is needed to get this thing portable 53K though, ya... that's just overkill! Maybe they should have opted for a CO2 portable instead