For convenience sake let’s say you have 2 identical lasers, one is blue and one is red. And you shine it on lead (so none of the light leaks through) until the lead doesn’t heat up anymore. Would the temperature change at all between the different color lasers. It doesn’t have to be red or blue, it could be microwave or x ray, just different colors is nessisary.
Eh, I think it’s helpful to point that out. If someone hit a dead end researching lasers, not making it out of the visible spectrum, that could explain why. Maybe they missed the line stating where laser ends, maybe the article assumed the reader would know that already.