Niels, At Nellis next week, I'll ask about laser jammers. They don't jam lasers, they jam IR missiles.
I think the Russian technique of using the same missile airframe with both radar and IR seekers was an ingenious 'belt AND suspenders" approach. I'm talking about AAMs here, carried on fighters and interceptors. As far as Manpads go, I think the Igla uses UV sensors too.
I wish I could take photos like these. Only once at Miramar did I see Fat Albert come straight at the crowd during the Twilight show with no lights on and then it fired it's flares off! Crowd went nuts!