Holy crap 300 secs is a long time to have 100kW of laser focused on you.
However, it likely requires in excess of 10 GIGA-watts or so of electrical power to produce 100kW of laser.
Actually, it looks like the electrooptical efficiency is in the 20% range, which means the input power should be 500 kW or so. Me want!
Yes, I studied plasma physics in college and know that the efficiency of gaseous lasers is low, about 2% or less. I am not sure what the efficiency of diode lasers is. I’ll bet it is much higher than gaseous lasers, maybe as much as 10-20%. If it required 10 GW of power, that would be the equivalent of 5 large nuclear reactors (5 X 2,000 MegaWatts).