A couple of days ago I asked Can a laser be used to clear the launch path of a rocket? turns out this is not a good plan but the answer by Hobbes suggests the idea of clearing debris with a laser is not completely out of the question.
...laser on a satellite, where it can shoot at targets at leisure, and not care how long it takes. That way you can also do selective ablation on larger pieces, and produce retrograde thrust to deorbit them. Power's still a problem though.
If we wanted to put laser(s) in orbit to and use them deorbit junk, at a rate of say 10% quicker then we are currently creating orbital debris, what would it take?
Does the laser currently exist that can create the retrograde thrust in the target? Could it be powered by solar or would it need another power source?