> Just wondering how the different lenses for laser pens work, the ones > that change the point to different shapes (a spaceship, arrow, etc.) Diffraction gratings? TWO-dimensional holograms? The great thing about LASER light is that all it's beams are meant to be parallel. Thus all you should need is a paper cutout and look! fancy shadow! :) (lousy attempt at ASCII diargams follow :) Laser light: Mask: Fancy shape: --------------------| --------------------| -------------------------------------- --------------------| -------------------------------------- --------------------| The mask just needs to be printed on a piece of plastic, or photo film. Ok... laser diodes need a colimating lens to make the beam parallel, but I believe most have the lens in the housing these days. or: maybe it's filtered through a specially cultured Perpyl Vilate crystal? -Josh Mayo [sig-less and LOVING it. ] ( Everything with a grin. :) PS: Erm... I'm lousy at writing Flames, aren't I? -- Subcription/unsubscription/info requests: send e-mail with subject of "subscribe", "unsubscribe", or "info" toWear-Hard Mailing List Archive (searchable): http://wearables.blu.org
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