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Thread: RGB Beam unification problem

  1. #1
    Join Date
    Feb 2008
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    Default RGB Beam unification problem

    The blue laser beam unification is no good, but I can't understand why?
    I produced some photos the problem 30 cm, 5m and 12m distance.

    Thank you for the help.
    Attached Thumbnails Attached Thumbnails 12m_distance.jpg  

    5m_distance.jpg  

    Blue_left_30cm_distance.jpg  

    2 x DIY RGB projector
    2 FB3
    Pangolin Beyond Ultimate and Pangolin Quickshow
    .

    My some show videos: https://www.youtube.com/channel/UC4Q...vDRS2QA/videos

  2. #2
    Join Date
    Apr 2007
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    Time to open up the projector and adjust the near field AND far field alignment. Post some pics of the beam combining in the projector.

  3. #3
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    Belgium
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    Default

    The near field alignment is not correct in your projector, this is why you see different unification at 0.3m, 5m and 12m.

    And as you have the misalignment on X axis, I can say that the problem comes from the difference between the beam height of your blue source who is a bit different than the beam height of the red and green sources.

    --- www.neodym.be ---

  4. #4
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    Default

    Oke, but..........The blue module is higher than what the green and red or lower than the green and blue module...or the blue dichro is not good positions...etc...what is the problem? How to raise the blue module height some 0,1-mm?
    Thanks,
    Last edited by whiteg; 07-19-2014 at 11:02.
    2 x DIY RGB projector
    2 FB3
    Pangolin Beyond Ultimate and Pangolin Quickshow
    .

    My some show videos: https://www.youtube.com/channel/UC4Q...vDRS2QA/videos

  5. #5
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    Authentic Asian food area of SoCal
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    Default

    Quote Originally Posted by whiteg View Post
    Oke, but..........The blue module is higher than what the green and red or lower than the green and blue module...or the blue dichro is not good positions...etc...what is the problem? How to raise the blue module height some 0,1-mm?
    Thanks,
    With a variation so slight as that, the module being raised up or down is probably not needed. A bump on the collimator can make a huge difference. Because a collimator is basically a screw, there is small amount X and Y play. When I am focusing my collimators for the first time, I make a target on my far wall and measure the beam movement and map out center. Once I mark center on the target, I LocTite my collimators and as the LocTite is curing, I do a final focus and move the beam to center to ensure that all the modules are of uniform beam height when they hit my dichros.

    This is why some people have two X-Y kinematics for each laser. It costs in real estate and a slight % of beam power but you have ultimate control of the beams, even if they are different heights.
    Last edited by absolom7691; 07-19-2014 at 11:48.

  6. #6
    Join Date
    Feb 2008
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    Hungary
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    Default

    Ok, thank you for the informations My laserwave modules is closed and warranty, I don't open now.

    I tried the blue module raise and the beam is perfect. And now I looking one thin, good thermal conductivity plate. What is the perfectly plate?
    2 x DIY RGB projector
    2 FB3
    Pangolin Beyond Ultimate and Pangolin Quickshow
    .

    My some show videos: https://www.youtube.com/channel/UC4Q...vDRS2QA/videos

  7. #7
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    Feb 2008
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    Hungary
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    I did different torque pulled the module mounting bolts, and the all module height correct now. I'm am happy
    2 x DIY RGB projector
    2 FB3
    Pangolin Beyond Ultimate and Pangolin Quickshow
    .

    My some show videos: https://www.youtube.com/channel/UC4Q...vDRS2QA/videos

  8. #8
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    Apr 2007
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    Costa Rica
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    I am happy for you!

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