Wikileaks has released many quasi-secret reports commissioned by the United States Congress, which should be in public domain legally. Among as much as 6,780 reports, I find 3 of them are on lasers. You might be interested in reading them.

1. Airborne Laser (ABL): Issues for Congress (RL32123 / 2007-07-09)
2. Lasers Aimed at Aircraft Cockpits: Background and Possible Options to Address the Threat to Aviation Safety and Security (RS22033 / 2005-12-21)
3. The Airborne Laser Anti-Missile Program (RL30185 / 2000-02-18)