Sure, that’s the most strategically sound. But it’s against the Geneva convention. Therein lies the problem.
I suspect that the power isn’t anything close to evenly distributed throughout the 30 cm. Chances are the lion’s share of the power is concentrated in a 5-10 cm diameter ring in order for this to have much of any effect - a far cry from focusing it on a pinhead, but enough at that power level to do a lot of damage. If you spread out the power through 30 cm, it probably wouldn’t do much good against anything except light gauge steel or organic material. The outer ring isn’t likely to damage metal but is still going to be enough to char anything organic.
What’s the Tom Clancy book where Clark and Chavez use one of those blinding weapons?
Well, Matt, they did say they following in the article.
So I don’t think it is intended as a tank-killer or anything, it looks like it is mostly designed to eliminate soft targets where collateral damage from high-explosives, even precision guided bombs, would be high. That’s the main concern about the blinding. This would presumably be used in civilian areas, putting non-combatants at risk of being blinded by reflections off, say, cockpits, windshields, chrome, etc.
Debt of Honor. Though I don’t think it was an actual “laser” they used, and I don’t remember if it’s effects would have been permenant or not (Seeing as most of the people it was used on were killed shortly afterwards)