It doesn't really sound all that likely. the reflection bit is irrelevant unless someone doesn't know how to direct their lasers... Of course, with lots of faceted surfaces it might be useful, but ice won't form that way naturally, it would have to be carefully calculated. Also, a direct hit would direct the energy into the ice... and eventual chaff would quickly be dispersed in the path of the laser. There are better materials for laser dispersal than ice. And honestly - when you build a spacecraft, the fact that ice is cheaper is not a major factor. Weight factors in too, I believe. You'd need a good thick coat of ice to make it useful, and then propulsion would be a problem. You'd have to calculate the trade-off.


Of course, laser weapons in space seems like a bad idea to me anyway. Or for that matter, most weapons. better to use the energy for propulsion.