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    Holography: how do to expand HeNe beam for Denisyuk Hologram?

    I'd like to you my Hene laser to create simple Denisyuk Hologram. But I have no Idea what inexpensive lens to use to illuminate the 5" square plate. I've seen people use concave mirror, double concave lens, microscope objective lens. Can I pick up any regular degular version of these from...


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