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    using a laser pointer as a signaling device

    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...
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    how to achieve a wide beam? how to achieve a long beam?

    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...




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