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Thread: Lens specs.

  1. #1
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    Default Lens specs.

    Looking at the lens-27 datasheet from Roithner it states:

    very high efficiency
    f = 3.6 mm
    N.A. = 0.45
    1 glass lens, AR coated
    designed for 633 nm 30 nm
    dimension 11.7 x ∅ 9 mm, M 9 x 0.5 mm
    black aluminium
    divergence: 2 mrad


    What does N.A. mean?
    What does divergence as a lens spec mean?

  2. #2
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    Hello Zoof,

    NA stand for numerical aperture, but i dont know the divergence spec.
    http://en.wikipedia.org/wiki/Numerical_aperture

  3. #3
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    a easy eplanation of divergence: The more mrad value, the more the laser beam will spread out/ increase in size from it's emmited divergence.

    small divergence value is good, large divergence number is bad.

    Bad divergence: a flash lite, beam spreads out very quick
    good divergence: a laser.

    hope it makes sense
    w.

  4. #4
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    Thanks Grimm!

    About divergence, I know what it is but I just don't see what it means as a lens specification.

  5. #5
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    Quote Originally Posted by Zoof View Post
    Looking at the lens-27 datasheet from Roithner it states:

    Thats an expensive collimator..
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  6. #6
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    Yes, it is expensive! I'm trying to figure out what is so special about it.

    Does anyone know a good source for collimating optics M9 0.5 pitch?
    Glass for >100mW red ARC
    And non-coated or 405nm coated for blu ray diodes?

  7. #7
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    I quite like this collimator:

    http://www.alltronics.com/cgi-bin/it...ers%2DHK10%2E4

    Has a small o ring holding the lens in place, and a cay046 just drops in place of the lens thats already in the collimator..

    [edit] Its not a metric thread tho..
    Last edited by dave; 02-29-2008 at 16:15. Reason: edit
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  8. #8
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    And a few of them mounted

    Just waiting on some mini mirror mounts to be made.. Planning on using 2 of these mounts to combine 6 diodes
    Attached Thumbnails Attached Thumbnails IMGP2777.JPG  

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  9. #9
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    Quote Originally Posted by Zoof View Post
    Looking at the lens-27 datasheet from Roithner it states:

    very high efficiency
    f = 3.6 mm
    N.A. = 0.45
    1 glass lens, AR coated
    designed for 633 nm 30 nm
    dimension 11.7 x ∅ 9 mm, M 9 x 0.5 mm
    black aluminium
    divergence: 2 mrad


    What does N.A. mean?
    What does divergence as a lens spec mean?
    Numerical arpeture is a measure of how well it collects light over a geiven angle.

    Steve Roberts

  10. #10
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    Quote Originally Posted by dave View Post
    Just waiting on some mini mirror mounts to be made.. Planning on using 2 of these mounts to combine 6 diodes
    Dave

    Will you be selling any of these mounts/mirrors? I'd like to have a go at combining 4 x MaXYZmodules to get 900mW.

    If you have some spare please PM me and let me know how much you want for them.

    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

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