Comment Re:Who do you trust with a death ray? (Score 1) 275
Your numbers are likely off by several orders of magnitude. 100W/m2 is 1/10th the energy density of direct sunlight. i.e. you can do ten times better than that with a flat mirror, no concentration.
Who says it has to a be a centimeter wavelength? How about the 95GHz pain beam? (I haven't checked to see what the atmosphere does at that wavelength, I would suspect clouds block it at the very least, but given that light is shorter wavelength and it penetrates well, I'm fairly certain there will be something between cm and nm that also works well.)
Of course in normal operation your 1000 units would beam to 1000 different reception sites at a safe level, it is only when you want to destroy someone that you divert them all to your enemy.