Yep, Traveller, around 1983 or so.
Originally Posted by Pharabus
In the movie the final laser is 6 megawatts. The Navy HEL shot is 100kW, about 1/60th of the movie weapon. It's pretty obvious 100kW is more than enough to kill a human. With an effective range of dozens or hundreds of miles these lasers could be used for sniping missions.
Originally Posted by Diesel_tke
But according to this abstract, there are also "strategic" class lasers also in development in the "multi-megawatt" range...stuff still classified...
They say the laser weapons are so fast and precise they can even detonate artillery shells midflight in seconds.