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    Focusing an Aixiz TTL Module

    I've purchased one of these 405 nM TTL modules, http://www.aixiz.com/store/product_info.php/cPath/71/products_id/437/osCsid/c2d8dafd1f5eaab5671f0e8ee4d64784 These are supplied with a glass 3 element lens, adjusted to a collimated beam, and presumably to nominal 150 mW output. Perhaps out of...
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    Hoping for tight focus

    Hi gang, I don't know enough about optics to do this on my own, so I'm hoping for some advice. My project has a couple of tight constraints and a bunch of loose ones, so I'm hoping it's feasible. First off, the goal is to melt plastic in a very small spot, and it's cost sensitive. (Those two...


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