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Recent content by genebrecht

  1. G

    How to achieve a wide & 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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