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Thread: Adjustable Focus Beam expander

  1. #1
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    Default Adjustable Focus Beam expander

    Hey guys,

    If i wanted to build an adjustable beam expander, similar to the one hb-laser offers, that i could place in a laser beam to use to adjust the end divergence of the beam, what type of lenses would i need ? I would want it to say, shrink the beam from 1x to 0.1x the size, to offer a 1x - 10x the beam divergence ?

    Cheers,

    Adrian
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  2. #2
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    Default

    hey guys,

    anyone have any info to help here?

    have a look at this link, we want to construct something like the first product on that page. not sure what type of lenses we would require.
    Now proudly stocking and offering the best deals on laser-wave

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    http://stores.ebay.com.au/Lasershow-Parts

  3. #3
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    Default

    Why not just buy HB's? I think that, for professionals who can afford to spend the money, there is no substitude for just buying an existing product from a well-established company with a good reputation that already works. You don't have to build everything yourself you know .

    Bill

  4. #4
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    Default

    Fair point, and I am waiting on pricing information back on that part from HB.

    However I still want to understand the magic around lens selection etc, for what I'd have thought is such a simple application it seems awfully hard to find information about it
    Now proudly stocking and offering the best deals on laser-wave

    www.lasershowparts.com
    http://stores.ebay.com.au/Lasershow-Parts

  5. #5

    Default

    I think a beam expander is basically just a telescope but used backwards, and the focusability comes from being able to change the distance between the objective and subjective lenses.

    In this case, a large biconvex subjective and a small biconvex objective, with focal point between them.

    An achromatic lens system would be more complex but the same idea.

    I'm just guessing so please feel free to correct me.

  6. #6
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    Default

    Well, if http://www.newport.com/OpticalAssist...mExpander.aspx is an accurate representation, the simplest version is just a concave & convex lens pair

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