Greetings,
I am planning to build a laser pointer to be used as a signalling device. Ie in the woods/camping/etc
I do not own a laser currently and i have never built one either, hence my set of questions. The goal that i am trying to achieve is having a wide/thick enough beam to be...
Greetings,
I have been reading this forum for about a few months, trying to learn about lasers, specifically about building one (in my case 2). I need to build a laser that will be seen 2 km away when the operator is pointing it up, basically as a signal.
I have seen a few beam expanders and...