some glass for the laser sniper rifle
Added 2017-12-05 02:49:38 +0000 UTC
Comments
it's probably a lot harder to do with mirrors, but if you use mirrors you'll avoid any wavelength dependent errors in your design (especially useful for imaging stuff). you only need two lenses to make the beam expander, and as far as optics go the math is incredibly simple. it's basically a Galilean telescope in reverse, but instead of leaving the distance between the lenses fixed, you put one lens in a threaded mount or something similar so you can change where the focal point ends up.
styropyro
2017-12-05 16:30:44 +0000 UTCI had the same Idea, but I don't know enough to actually do it. My idea was to expand the beam onto some kind of parabolic reflector, like the opposite of a satellite dish. I could not figure out how to get it to focus at more than one distance though. It must be possible, the military can do it somehow.
TheBackyardScientist
2017-12-05 14:14:05 +0000 UTC
