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Thread: Beam paths in projector?

  1. #1
    Join Date
    Jun 2008
    Location
    Seattle WA
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    45

    Default Beam paths in projector?

    So I have been building my projector and I have a few questions about combining red and green to get yellow and how to control it. I know I need to get a dichro and a mount but how do I control it ? is there a galvo i hook it too to combine the beams when the dac calls for yellow ? If that is the case how do I get just the red there when I dont need yellow ?

    Is it anything like this picture I made ?

    Thank you

    Liam
    Attached Thumbnails Attached Thumbnails Untitled-1.jpg  


  2. #2
    Join Date
    May 2006
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    Native Floridian
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    3,101

    Default

    Hi Liam, I asume you are going to use solid state lasers with either analog or TTL modulation. This will control what color beam makes it to the scanners. The dichro itself is not much more than a piece of glass with an optical coating, which will pass the color green and reflect the color red. The dichro should be mounted to something like an MM-1 so you can have some fine adjustment to keep the beams in alignment. If you do a search here on PL for "near field" and "far field convergence" you should find some great reading on how that all works. But the dicrho itself is not a blanking device, if you want a red beam to the scanners, it will just reflect red to the scanners, if you want a green beam to the scanners, it will just pass the green beam, if you want yellow, it does both, passes the green beam and reflects the red beam.

  3. #3
    Join Date
    Jul 2005
    Location
    Lancashire UK
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    1,379

    Default

    just like DZ said above ...

    theres lots of info here on PL ..

    use the search ......

    my last post wa abut combining beams



    please read the post here

    http://www.photonlexicon.com/forums/...ead.php?t=3844


    but also use the search to find out dichros ,,, etc



    all the best ... Karl

  4. #4
    Join Date
    Jun 2008
    Location
    Seattle WA
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    Default

    Quote Originally Posted by DZ View Post
    Hi Liam, I asume you are going to use solid state lasers with either analog or TTL modulation. This will control what color beam makes it to the scanners. The dichro itself is not much more than a piece of glass with an optical coating, which will pass the color green and reflect the color red. The dichro should be mounted to something like an MM-1 so you can have some fine adjustment to keep the beams in alignment. If you do a search here on PL for "near field" and "far field convergence" you should find some great reading on how that all works. But the dicrho itself is not a blanking device, if you want a red beam to the scanners, it will just reflect red to the scanners, if you want a green beam to the scanners, it will just pass the green beam, if you want yellow, it does both, passes the green beam and reflects the red beam.
    LOL I cant believe I did not come to that myself. I like to way over complicate things in my head.

    Thank you

  5. #5
    Join Date
    Dec 2007
    Posts
    93

    Default

    Another thing. If you can, put the red laser in place of your mirror, and lose the mirror. You want as little mirrors in there as possible. Each of them is a 1..10% loss.

    I've bought dichro's from Laser-wave (username Bridge here on the forum) They should arrive today!

    Here is the website which also contains a picture on how to set them up: http://laser-wave.com/eproduct_show....assid=43&id=35

  6. #6
    Join Date
    Jan 2007
    Location
    Yorkshire, UK
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    4,585

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    Quote Originally Posted by highvolt View Post
    Another thing. If you can, put the red laser in place of your mirror, and lose the mirror. You want as little mirrors in there as possible. Each of them is a 1..10% loss.

    I've bought dichro's from Laser-wave (username Bridge here on the forum) They should arrive today!

    Here is the website which also contains a picture on how to set them up: http://laser-wave.com/eproduct_show....assid=43&id=35
    Yes, but having that mirror in place makes alignment much easier

    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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