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Thread: Losses within scanner

  1. #1
    Join Date
    Dec 2006
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    Pflugerville, TX, USA
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    Default Losses within scanner

    How much power are you all losing through your scanner dichros and mirrors? I'm only getting around 1/2 of what my laser put out. I could stand to clean my mirrors but I don't know how much good that will do.

    I think my galvo mirrors are to blame for most of it. The only other mirrors I have are the red and blue dichros that I got from Edmunds Optics and they should be pretty good.

  2. #2
    Join Date
    May 2007
    Location
    Milwaukee WI
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    Default

    First make sure that you are not measuring and IR light coming from your green or blue.

    Second, meter before dichros, after dichros, and after galvos... Post your results here, I would like to see them.

    1/2 to losses would be a fairly inefficient system.

    Also what galvos are you using?

    -Max

  3. #3
    Join Date
    Aug 2006
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    North West England
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    Default

    I have massive losses on the DT40pro galvos. IIRC I lose about 40%

    Jim

  4. #4
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    I have the DT40pros and I haven't seen that much in losses :-/

    I will check again when I get my projector back together.

  5. #5
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    Default

    Sounds about like my galvo mirrors. That annoys me because the specs I received for the galvos said the reflectivity was >95%.


    Quote Originally Posted by JimBo View Post
    I have massive losses on the DT40pro galvos. IIRC I lose about 40%

    Jim

  6. #6

    Default

    i have original dt40's (not pro's) i have replaced both mirrors, i got the replacement from Jian.

    i will do some testing soon
    Eat Sleep Lase Repeat


    Aluminium Optic Mounts

    http://www.laser-man.co.uk/opticmounts/

  7. #7
    Join Date
    Jan 2006
    Location
    Charleston, SC
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    2,147,488,218

    Cool

    I loose between 4% and 5% across each mirror, for a total loss of between 8 and 9% across the scanner pair. The losses are about equal on both my original DT-40's and my newer DT-40 pro's, and are comparable with the losses I've measured on other galvos I've reviewed.

    If you're loosing 40% across your scanners, something is seriously wrong.

    Adam

  8. #8

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    i lose about 100mw at 3 watts argon. (give or take) but have not burned them yet! they seem to pass the light and lose the heat.

  9. #9
    Join Date
    Apr 2007
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    Toronto Canada
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    About 10% tops across all dic mirrors and golvos. Check your galvos and make sure you install them right. Coating is on one side so make sure this side is the one reflecting.!
    I hired an Italian guy to do my wires. Now they look like spaghetti!

  10. #10
    Join Date
    May 2007
    Location
    Milwaukee WI
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    Default

    Yeah the way to make sure that you are reflecting off the front surface of the front surface mirror is to hold something up to the mirror. If the reflection touches the object then that is the correct side. If the reflection is a little bit distant then that is the bad side. I use something like a needle, and I touch to a part of the mirror close to the shaft where the laser will never hit.

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