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Thread: pointer

  1. #1
    Join Date
    Apr 2010
    Grand Rapids, Mi

    Default pointer

    not trying to stir up the pot, just curious how they are claiming TEMoo I thought that meant a perfect round dot (?)

    EDIT:tried to edit but cant change topic left the TEMoo out on accident
    leading in trailing technology

  2. #2
    Join Date
    Jan 2006
    Charleston, SC


    Technically, TEM 00 simply means that there is only one distinct beam. It doesn't actually stipulate the shape of that beam.

    True, the classic example is a cylindrically-symmetrical beam with a Gaussian profile, but obviously there are other lasers out there with different profiles. They can still be classified as TEM 00, however.

    Edit: I wonder about these particular 445 diodes, however. Are they in fact single emitter diodes, or are they multimode?

    Last edited by buffo; 06-11-2010 at 07:26.

  3. #3
    Join Date
    Jan 2009


    The diode in the pointer he linked to comes from the Casio projector. It's multimode. Definitely not TEM00 in the strictest sense.. I'm sure there isn't even any sort of correction other than just a normal lens.

  4. #4
    mixedgas's Avatar
    mixedgas is offline Creaky Old Award Winning Bastard Technologist
    Infinitus Excellentia Ion Laser Dominatus
    Join Date
    May 2007
    A lab with some dripping water on the floor.


    Depending on how the clean it up, its probably "TOP HAT" that looks like Tem00 classic Gaussian with a flat top instead of the Gaussian "steep sided bell shaped" curve.

    Only way to know for sure is expand it with a lens, do a knife edge measurement, or put it on something like my Spiricon CCD based beam analyzer.

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