As siegecrossbow suggested it depends on range weather, exposure time,etc. A good high power industrial laser cutter of 600W can cut through if it's close enough and if you give it enough time but apparently this would not do much as a weapon.
The problem would be how to squeeze large amount of energy at one time without various electrical components to explode but is compact enough so it can be transported on a van or other small size vehicles.
Another point is direct energy weapons are not designed to defeat 1000mm of steel armor on the battle field. Missiles, cars, planes, etc. have far less armor plating to obtain maximum range.