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Thread: What is the optimal dichroic sequence?

  1. #1
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    Default What is the optimal dichroic sequence?

    1: 532 nm > 637nm > 445nm > scanner.
    2: 532 nm > 445nm > 637nm > scanner.

    How can we achieve the minimum loss of light?

    Thx,

  2. #2
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    It all dpends on how good each of your dichros are.
    I have some of mine:
    532-->445-->638-->scanner
    Some
    445-->532-->640-->scanner
    or
    445-->638-->532--scanner

    The last one seems to work surprisingly well, probably due to the fact the last dichro from the Casio projectors is very good for both transmission and reflect, and dirt cheap and abundant.
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    You are using Bonetti's defense against me, ah?

    I thought it fitting, considering the rocky terrain.

  3. #3
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    Quote Originally Posted by norty303 View Post
    445-->638-->532--scanner

    The last one seems to work surprisingly well, probably due to the fact the last dichro from the Casio projectors is very good for both transmission and reflect, and dirt cheap and abundant.
    What ratio are you using, and what dicro do you recommend for the first one?
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  4. #4
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    If red is your weakness then red last. I wished I could have done this but I had issues with my dichros choice that resulted in in 532-->638-->445->>scanners being the best.
    This space for rent.

  5. #5
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    I ask Because I read that some of the dichroic good does not good pass the 445 nm wavelength. Therefore, it was Suggested hurt the 445nm to the end of the line.
    But, there may dichroic today is well set up for the 445nm wavelength.

  6. #6
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    Quote Originally Posted by whiteg View Post
    I ask Because I read that some of the dichroic good does not good pass the 445 nm wavelength. Therefore, it was Suggested hurt the 445nm to the end of the line.
    Yep that was the case for me, see above. Dichros from Dave, can't remember the brand so maybe Dave can chime in and advise.
    This space for rent.

  7. #7
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    445 is also the cheapest, so easiest to make up for the losses over multiple transmission stages.
    The Casio dichro has very good transmission in this respect, and I think i use the good Laserwave pass blue/reflect red for the other one (i.e. NOT the earlier one which was crap)
    http://www.facebook.com/SubsonicSystems
    http://www.frikkinlazors.co.uk

    You are using Bonetti's defense against me, ah?

    I thought it fitting, considering the rocky terrain.

  8. #8
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    I've never heard of Casio dichroic. Where to buy?

    I using dichroic LaserWave, Blue reflect / Green and Red pass. I do not have red module (637nm) now.

    But I want to know what kind of dichroic to buy, when I buy red module in the future.

  9. #9
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    Dichros that come from the Casio video projectors that people harvest the 445 A140/M140 diodes from.
    Contact DTR, he sells surplus sets of mirrors and dichros.
    Dan Briggs did a test of the 2 types of dichro when they first appeared.
    http://www.facebook.com/SubsonicSystems
    http://www.frikkinlazors.co.uk

    You are using Bonetti's defense against me, ah?

    I thought it fitting, considering the rocky terrain.

  10. #10
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    My setup contains the Stanwax rectangular RGB2/GB dichroics
    G(532nm)-> B(445nm)-> R(638nm)-> galvo mirrors
    Would someone measure the loss on the mirrors for the green 532nm with an LPM if he has of these please?
    I havn't got any measurement.
    I see a lot of unwanted reflect of the green but not the other colors.
    The dichroic mirrors' surfaces are very clean i never touched them.
    I've tried them flip but the results are the same on both side of the coating(high losses for green)
    Are have AR coating or just they are dichroic coated only?
    Thank You!
    Ferenc
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    Last edited by epyn; 02-18-2014 at 06:11.
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