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Thread: Anamorphic prisms- FA or mode correction?

  1. #1
    Join Date
    Oct 2010
    Posts
    118

    Default Anamorphic prisms- FA or mode correction?

    OK, so, really stupid question.

    I've done what I can to read up about these things, with not much luck.

    I just want to know- are they for mode correction or for FA correction?

    Some say they simply fix the highly-divergent fast axis, while others have said they circularize the beam.

    So what's the case with these, then? Do you need seperate optics after the prisms to get a round beam profile, or do the prisms also fix up the beam profile as well as correcting the fast axis?

    Thanks in advance.

  2. #2
    Join Date
    Oct 2006
    Location
    Central Florida
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    7,067

    Lightbulb

    I believe it is FA correction and I truly don't feel we are going to get a round beam out of these. Perfectly square is the best we can hope for in my opinion. I think we might want to start looking for ways to expand our greens a bit to match the red and blues a bit more.
    Love, peace, and grease,

    allthat... aka: aaron@pangolin

  3. #3
    Join Date
    Oct 2010
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    118

    Default

    Mmm, didn't think it'd work miracles with the beam profile.

    Anyway, I'd just be happy if the FA and SA have the same divergence. You could probably adjust your green out to match it, and the red too.

  4. #4
    Join Date
    Jul 2007
    Location
    west sussex uk
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    2,279

    Default beams

    what reds and blues are you using that are bigger than greens ?
    my problem is the other way round i have 640nm @.8mrad ,445 @1mrad, and a fat arsed green @1.5mrad

  5. #5
    Join Date
    Dec 2008
    Location
    Southport, UK
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    2,746

    Default

    A tilted bi convex lens can go some way to circularising a beam.
    http://img62.imageshack.us/img62/3985/laser.gif

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  6. #6
    Join Date
    Oct 2010
    Posts
    118

    Default

    Ahh, so it is for divergence correction.

    Thanks for clearing that up.

    I wasn't expecting miracles either, but if it's got less than 2mRad divergence, I'm happy.

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