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Thread: Multiple beams after passing through dichro - is this normal?

  1. #1
    Join Date
    Jul 2007
    Location
    Knoxville, TN & Huntsville, AL, USA
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    3,094

    Default Multiple beams after passing through dichro - is this normal?

    FINALLY, after upteen-gazzillion delays and excuses, I've started active assembly on my RGB projector (no, seriously, Buffo!). I can already tell the optical alignment process in going to be TONS of fun!

    SO, here's the noob question:

    I'm using a dual-Maxyz for my red laser. Through a little tweaking of the mirror & PBS mounts on the dual plate assembly, I'm able to get a pretty nice single spot on my flame retardent () target . However, I noticed that when the beam is reflected off of a pass green / reflect red dichroic filter (Edmunds), I wind up with one normal-size beam spot, and a couple of smaller beam spots touching either side of the primary beam.

    Is this normal for a beam that first passed through a PBS cube?

    Thanks in advance!

    Randy
    RR

    Metrologic HeNe 3.3mw Modulated laser, 2 Radio Shack motors, and a broken mirror.
    1979.
    Sweet.....

  2. #2
    Join Date
    Oct 2006
    Location
    Central Florida
    Posts
    7,067

    Lightbulb



    Actually for the maxyz, there will be "wings" on two sides of each beam and on all four sides of two combigned beams. Is this what you are seeing.
    Love, peace, and grease,

    allthat... aka: aaron@pangolin

  3. #3
    Join Date
    Jul 2007
    Location
    Knoxville, TN & Huntsville, AL, USA
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    3,094

    Default

    Oh, no - the dreaded "this is worthless without pictures" message!!

    Yep, that's what I'm seeing allright - I'll post pictures a little later.

    Speaking of pictures - any recommendations on digital camera settings to get a good photo of beams and target spots? I'll be using a Nikon Coolpix 4300 - old, beat-up (2 overseas deployments!), but still working! The "Timex watch" of digital cameras!
    RR

    Metrologic HeNe 3.3mw Modulated laser, 2 Radio Shack motors, and a broken mirror.
    1979.
    Sweet.....

  4. #4
    Join Date
    May 2007
    Location
    Milwaukee WI
    Posts
    1,355

    Default

    If you had the choice of any camera... find one that you can manually set the exposure settings. Pretty much any digital SLR camera can do it. And I think some Canon point and shoot will let you go up to like a 10 or 30 second exposure.

    I have a sony point and shoot that is 7.2mp if I use that I set it on the 'night' setting for the longer exposure. Or I just use the Canon Rebel XTi

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