If you thought building your own laser weapon at home was hot stuff, you haven't seen anything yet. Do-it-yourself fan Styropyro has built a laser "shotgun" whose eight 5W beams are adjustable with lenses, much like you'd adjust the choke on a conventional shotgun to narrow or widen its buckshot spread. As you might gather, 40W of combined laser power is pretty powerful -- and unbelievably dangerous. The gun can destroy everything from balloons to ping pong balls, and there are reflected beams that could easily smack someone's eye. Don't try this at home, folks. It's still an impressive feat of homebrew engineering, though, and Styropyro is hoping to make something "even crazier" before long.
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Youtube Video:
https://www.youtube.com/watch? v=iVrJUbeuG44