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    Laser with common battery?

    A few years ago I bought my first green laser off of ebay which was very close in looks (if not identical) to this... Stylish 5mW 5 mW 532nm Green Beam Laser Pointer Pen New - eBay (item 280572810176 end time Dec-07-10 11:53:28 PST) ...but I don't think that is who I bought it from. It was...
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    5mW vs 50mW

    I bought a 5mW green pen from ebay long before I found this site. I thought it worked great. Good beam visibility and distance. Next I bought a 50mW module from O-Like. Tonight we compared them side by side and we could tell no difference. Any ideas on what is happeing? Is the O-like...
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    What increases side view of beam?

    What increases the visibility of a side view of a laser beam? (Without depending on particles in the air) Power? Beam width? Magic?
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    low power - high duty cycle?

    What are some options for a low power (5mW), high duty cycle (100%?) green laser? It does not need to be hand held or portable. Side view of the beam is important but I can enhance it with fog. I was thinking about building a game where kids avoid tripping a laser beam. If you trip the beam...


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