How do i make a powerful laser?

Question

explain on here

and wat is the laser housing and were do i get it and do i need it

Answer 1

I found this site, there is some laser projects the simplest one is nitrogen laser.

Answer 2

The problem with high powered lasers is the danger of blinding someone permanently.

And not by directly pointing it at someone! a reflection off any shiny surface will do.

And there is no way you could turn one of these on in the open and be sure that it won't hit a piece of metal or a wet surface, and bounce off and hit someone standing a block away and blind them. Or bounce back and hit your eye.

Or use it in a room, and have a reflection go out a window and hit someone a mile away.

Would you like to have only one working eye the rest of your life?

When they are used in industry, it is in a room with no windows, and limited access. Everyone wears goggles.