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Thread: -6mm FL Coated Lenses

  1. #1
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    Default -6mm FL Coated Lenses

    Hi all

    Anyone know of anywhere I could buy a couple of -6mm FL lenses?

    I need these as a means of rapidly expanding a laser beam over a very short distance. Diameter of probably no less than 5mm as below that they become difficult to mount.

    Either plano concave or bi-concave form would be suitable. Preferably reflection free coated for visible wavelengths as i'll be using them with 532nm and 632.8nm lasers.

    Edmund Optics have them but I was hoping for a cheaper source if possible.

    Many thanks

    Jem
    Quote: "There is a theory which states that if ever, for any reason, anyone discovers what exactly the Universe is for and why it is here it will instantly disappear and be replaced by something even more bizarre and inexplicable. There is another that states that this has already happened.... Douglas Adams 1952 - 2001

  2. #2
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    you could try roithner
    Eat Sleep Lase Repeat

  3. #3
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    yep these are the ones from roitner:

    GS-7021-2C, 5 x 2.3 mm, f = 6 mm, ARC, laser diode collimator

  4. #4
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    He is looking for a -6mm concave lens, that is a +6mm convex lens.

    Have you tried surplusshed yet?

  5. #5
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    sorry i missed that

  6. #6
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    Thanks guys

    Krazer, thanks. I couldn't remember the name of Surplusshed. I'll take a look.

    Cheers

    Jem
    Quote: "There is a theory which states that if ever, for any reason, anyone discovers what exactly the Universe is for and why it is here it will instantly disappear and be replaced by something even more bizarre and inexplicable. There is another that states that this has already happened.... Douglas Adams 1952 - 2001

  7. #7
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    Quote Originally Posted by krazer View Post
    He is looking for a -6mm concave lens, that is a +6mm convex lens.
    For diverging purposes I guess he'd also go with positive one.
    These can be found with shorter f.l., like 4.6mm from Thorlabs.

    Piotr.K

  8. #8
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    Sorted now, thanks folks
    Quote: "There is a theory which states that if ever, for any reason, anyone discovers what exactly the Universe is for and why it is here it will instantly disappear and be replaced by something even more bizarre and inexplicable. There is another that states that this has already happened.... Douglas Adams 1952 - 2001

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