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Thread: This week I will be mostly building an RGB

  1. #21
    Join Date
    Jan 2007
    Location
    Yorkshire, UK
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    4,585

    Default

    Possibly stating the obvious, but...

    Try turning the dichro around and firing the beam through the opposite surface. depending on how the lenses have been coated this may have an effect on performance.

    Jem

  2. #22
    Join Date
    Feb 2007
    Location
    Herts, UK
    Posts
    1,254

    Default

    Thanks for the thoughts

    The angle is almost spot-on 45 degrees and the dichro has been tried both ways round, and currently has the blue reflecting off the coated surface.
    It's almost as if the filter is polarized in some way (we haven't tried rotating the dichro) but I didn't think they were pol. filters...?

    The Edmunds spec states for that dichro:

    510nm ± 15nm: Rabs= 50%
    400-475nm: Rave> 98%

    Which indicates that it should transmit a large percentage of the green once your into the 532nm region, and the transmission curve seconds that as well.

    Now I'm confused... I thought many others had used the Edmunds NT47-264 (or the 25mm diameter version, PN: NT47-267) to get the blue beam mixed with the yellow
    Last edited by p1t8ull; 10-01-2007 at 08:36.

  3. #23
    Join Date
    Oct 2006
    Location
    Central Florida
    Posts
    7,067

    Lightbulb

    That is the one I have. I just checked my order email. I don't lose that much. I don't have a meter, but at SELEM I think I was getting at least 90mW after the galvos off my 150mW lasever. I don't think it was producing 150mW either, closer to 120.

  4. #24
    Join Date
    Aug 2007
    Location
    Under a rock in Cambridge UK
    Posts
    1,353

    Default

    Hey guys, thanks for all the replies.. Think I might have a bit more testing to do...

    I have now got it working, just a bit more fine tuning to be done, but here is its first attempt at scanning...
    Attached Thumbnails Attached Thumbnails DSCN0699.JPG  

    DSCN0701.JPG  

    DSCN0702.JPG  


  5. #25
    Join Date
    Dec 2006
    Location
    Essex, UK
    Posts
    8,648

    Default

    wow !
    Eat Sleep Lase Repeat

  6. #26
    Join Date
    Jun 2007
    Location
    northern maine.
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    329

    Default

    Quote Originally Posted by andy_con View Post
    wow !
    yeah!
    that looks fantastic!

  7. #27
    Join Date
    Sep 2007
    Location
    ,essex, uk
    Posts
    166

    Default

    looks cool, nice job

  8. #28
    Join Date
    Jan 2006
    Location
    S.E. Florida
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    483

    Default

    Looks great!
    "Gravity its not just a good idea its the law"

  9. #29
    Join Date
    Jan 2007
    Location
    Florida
    Posts
    4,382

    Default

    Uh- yeah WOW! nice pics

  10. #30
    Join Date
    May 2007
    Location
    Milwaukee WI
    Posts
    1,355

    Default

    I think I speak for everyone when I say "I want more pictures!" that looks incredible, I cant wait until I can afford my 457nm

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