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Thread: Help picking Dichros...

  1. #1
    Join Date
    Oct 2006
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    Central Florida
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    Default Help picking Dichros...

    Greetings,

    I'm only a few pieces away from being able to build a RGB projector. I was looking for optics and found a seller, on eBay , that has several dichro optics for sale. I just don't know which I need. Could someone help me chose :?:

    The seller has 7 optics the I thought would do the trick. I think I need what, 2 maybe 3 of them. I guess a good question is what color should you start with in a projector? Or does it matter? I need one mirror, broadband? to reflect the first color beam onto the "path", a dichro to reflect the second color and transmit the first making the first combined beam, then a second dichro to reflect the third color and transmit the first combined beam making the second combined beam that should goto the scanners... Correct?

    First one Reflects at 615 to 800, Transmits 450 to 590... I'm not sure what random polarization means though... :?

    Next Reflects at 500 to 530 and 580 to 780, Transmits 450 to 490

    Third Reflects 575 to 700, Transmits 400 to 550

    Fourth Reflects 400 to 600, Transmits 615 to >800

    Fifth Reflects 525 to 700, Transmits 400 to 500

    Sixth Reflects 510 to 590, Transmits 610 to 670

    Seventh and last... Reflects 500 to 620, Transmits 650 to 800+

    Would this be a good place to purchase dichros? I have been looking a little but this is the only place I have really found... :?

    Thanks everyone :!: :!: :!:
    Love, peace, and grease,

    allthat... aka: aaron@pangolin

  2. #2
    Join Date
    Aug 2006
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    North West England
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    Default

    The way I did mine was as follows:-

    Set the blue laser up 1st pointing directly at the galvos, this way there is no loss on a mirror.
    Then the green at a dichro, so you need a pass at 473 and reflect at 532, so use the fifth (pass 400-500 reflect 525-700),
    Finally introduce the red with the third (pass 400-550, reflect 575-700).

    Jim

  3. #3
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    Oct 2006
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    Central Florida
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    Thanks man! I was doing some drawings and came to the conclusion that this configuration is the only way I can do it with the mirrors listed... I think... that was a few hours ago... :roll: Your's is better reasoning though...

  4. #4
    Join Date
    May 2006
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    Default

    Here is what I use for dichroic filters:


    http://www.edmundoptics.com/onlineca...productID=2433


    Also, I looked at only a couple of the links you listed, and there was no real spec on what AOI is required to obtain the transmission/reflection specified. If you follow the link above it will take you to what you really need. Notice they are specified for 45 degree AOI. There is also some good info to read on the Edmund website about dichroics.

    David

  5. #5
    Join Date
    Oct 2006
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    Central Florida
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    Thanks David. To get approval I have to go with the lowest bidder... This is the prototype and I have to build it on the cheap or the girlfriend/boss won't allow fundage... ops: I know I may regret it, but it won't get built if I get top of the line for the prototype... I wish I could.

  6. #6
    Join Date
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    cheap or the girlfriend/boss won't allow fundage...
    Ha! That I understand! Except, I have to go through a wife and a daughter to get approval for my laser related expenditures!

    David

  7. #7
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    We've been living together for almost 8 years... might as well call her the wife... :roll:

  8. #8
    Join Date
    Jul 2006
    Location
    Belgium
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    Default

    Seems like (almost) everybody here has the same problem with the wife or girlfriend (except marconi perhaps ).

  9. #9
    Join Date
    Aug 2006
    Location
    North West England
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    Default

    Just try to explain thet the more expensive ones make "prettier" pictures :lol:

    Jim

  10. #10
    Join Date
    Nov 2005
    Location
    Melbourne, Australia
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    3,677

    Default

    Quote Originally Posted by DZurcher
    Here is what I use for dichroic filters:


    http://www.edmundoptics.com/onlineca...productID=2433


    Also, I looked at only a couple of the links you listed, and there was no real spec on what AOI is required to obtain the transmission/reflection specified. If you follow the link above it will take you to what you really need. Notice they are specified for 45 degree AOI. There is also some good info to read on the Edmund website about dichroics.

    David
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