Could be a crowd control or riot disperse. It doesn't seem to carry enough energy knock down incoming projectiles.
Do you think this is something that could fit on a type 99 tank, or maybe that the self defense laser on the type 99 works similarly?
I don't think that laser blinder is really that effective, or else Western companies would definitely have fitted it on their own tanks. I mean those engineers are not dumb or lacking innovation.
It is very hard to blind another tank in real combat. The lasers have to hit the optics at very precise angle and the beam has to be strong enough, which require clear weather.
I think the North Koreans used it on American helicopters patrolling near the border and caused some problems as well.