>>13428185All the laser needs is line of sight. If it can see a plane, it can also strike at it (within range, and ideally this range would be "anything I can see"). Unless we can make planes optically invisible across multiple wavelengths, stealth is no safety.
You might be able to hide from radar and other detection systems, or blow up the radar first, which would prevent the lasers from knowing where to look when you're approaching. Possibly. I believe we've already reached a point where anti-stealth technology is outpacing stealth, to say nothing of future developments like...
Passive radar. The problem with active radar is it tells the guy you're looking for exactly where you are. You're both in a dark room searching for each other, but you've got a flashlight you are waving around to try and find him with. Obviously he can see the flashlight, and you're just counting on him having a knife and being far away while you have a pistol.
Passive radar doesn't give you away. It sends out no signals, it only receives. It's looking at all the other natural or man-made signals (like TV and radio and satellite) that are in an area and establishing a map, so that when an object enters its range and those other signals behind bouncing off it (or don't go through it, since they're absorbed), it sees this disturbance.
Imagine that you are in a dark room that is completely surrounded by strings of Christmas lights. You're stationary and laying on the ground, so you're not really in the way of anything and are indistinguishable from other features of the room, like a piece of furniture. But the jet is a man walking around, and you can see every time he walks between you and a light. More broadly, you're both in a twisty hallway lit from many angles by waist-high lights, and he's walking around. You see every shadow he casts on the walls as he moves, even if he's out of your line of sight.
