Well, you'd have to heat it faster than the heat conducts away through the ice, so that's a bigger heat flux than you can easily deliver with em radiation. You'

Well, you'd have to heat it faster than the heat conducts away through the ice, so that's a bigger heat flux than you can easily deliver with em radiation. You're doing a big area if you want a runway so you'd probably be better off with a floodlight than a laser. And you're just gonna melt the ice to water so you probably want a pump or something to remove the water.