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Thread: NEWB: Dichro fitting

  1. #1
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    Default NEWB: Dichro fitting

    Hi Guys,

    Sorry to sound like a newb, but thats what I am!

    I picked up a pair of dichros from Dave last year, I am finally fitting them. I have:

    1 x reflect blue transmit green & red dichroic filter
    1 x reflect red transmit green & blue dichroic filter

    Now, I have fitted these to the mounts, I have *assumed* what appears to be the reflective surface is fitted towards the reflected laser. Correct?

    What is puzzling me is this:

    Dichro 1: Refects 660 & 445, Passes 532
    Dichro 2: Refects 445, Passes 532 & 660

    Shouldn't the 1st refect ONLY 660?

    Any help, tips, clues etc welcomed!
    This space for rent.

  2. #2
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    Quote Originally Posted by dnar View Post
    Now, I have fitted these to the mounts, I have *assumed* what appears to be the reflective surface is fitted towards the reflected laser. Correct?
    you got that absolutely correct (in that sense, a dichro is like a front surface mirror). otherwise, the reflected beam will pass the dichro two times and create reflections and artifacts.


    Quote Originally Posted by dnar View Post
    Dichro 1: Refects 660 & 445, Passes 532
    Dichro 2: Refects 445, Passes 532 & 660
    there is not much choice with the dichros you've got. green, then red and then blue is the only way to go.

    if you could talk with dave and "exchange" a dichro, you could have a better setup with the red as the last colour and closest to the scanners.
    this way you have minimum losses for red as it only reflects off one dichro and you can compensate the losses in blue with some extra power

    could you post some reflect and transmit losses after you are done installing?

    thanks,
    chris
    "its called character briggs..."

  3. #3
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    Default

    Quote Originally Posted by dnar View Post
    What is puzzling me is this:

    Dichro 1: Refects 660 & 445, Passes 532
    Dichro 2: Refects 445, Passes 532 & 660

    Shouldn't the 1st refect ONLY 660?
    Hi Wayne,

    The reason for this is that it allows alternative configurations to be serviced by the same dichro.

    I have the same setup in my projector. You can do as suggested and use an alternative order to get the most of your red, but the dichros that offer decent transmission and reflection losses are more expensive and harder to come by.

    Cheers,
    Tony

  4. #4
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    The laser-wave reflect red dichro doesn't work so well with 445 as you have just discovered.

    I do have some Kvant dichros here, however they are 10mm x 20mm, not round. Would this be of use? If so, Ill send you over a bit
    KVANT Australian projector sales
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  5. #5
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    Thanks Guys,

    I have it all in mock up now, G, R, B, DT30's. It looks :drop jaw: amazing!!! Tomorrow is drill and tap day.

    Happy days.
    This space for rent.

  6. #6
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    Quote Originally Posted by dnar View Post
    Thanks Guys,

    I have it all in mock up now, G, R, B, DT30's. It looks :drop jaw: amazing!!! Tomorrow is drill and tap day.

    Happy days.
    Congratulations!
    Pics please!


  7. #7
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    El Paso, Texas USA and Juarez,Chihuahua Mexico
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    Right on Wayne! I've been putting off drill&tap day for a while now as I've never done it before. It may become "mark&take to the machine shop" instead here.
    Wiki:The first visible wavelength laser diode was demonstrated by Nick Holonyak, Jr. in 1962.



    FS: hi grade SEAL DUST

  8. #8
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    Drill and tap complete.
    Near field alignment complete.
    Far field alignment complete.
    Colour balance adjustment complete.

    Oh man, I am like a fat kid with a lolly-pop! So much fun!

    A Big thanks to Rob (Stanwax) for his excellent beam alignment guide, Bill for his excellent projector wiring paper and to all those that have helped me with info and parts (Dave, Adam, Simon etc.).

    Click image for larger version. 

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    I can't wait for the sun to go down...

    Next on the agenda is completing the e-stop, long cable runs, Laser Safety course/license on Aug 12 and then my first live show on Sept 20!

    EDIT: Can Mr Admin please move this post to my build log ? http://www.photonlexicon.com/forums/...-RBG-Build-Log
    Sorry for the muck up, having a blonde day.
    Last edited by dnar; 08-02-2011 at 23:18. Reason: Blonde day
    This space for rent.

  9. #9
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    Woa!! Looking good there mr wayne!!!

    can i have moar pics and photons please?
    "its called character briggs..."

  10. #10
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    Quote Originally Posted by LaNeK779 View Post
    Woa!! Looking good there mr wayne!!!

    can i have moar pics and photons please?
    Sure! I'll wait for Sol to go to bed.
    This space for rent.

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