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Thread: Laser power when going through dichro?

  1. #1

    Default Laser power when going through dichro?

    OK ive just received this meter
    http://www.die4laser.com/D4Thing/D4Thing.html

    its really good, but question

    heres my setup



    The red is brand new (three days old) and its from aixiz and should be 200mw and the green is a 100mw module.

    Now a few weeks ago i tested the green and it measure 300mw or 106mw with an IR filter.

    When i use my new meter at the window of my scanners its only measuring 26mw of green??? and something like 10mw of red???

    should i really loose this much through a dichro and the scanner mirrors???
    Eat Sleep Lase Repeat


    Aluminium Optic Mounts

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

  2. #2
    Join Date
    May 2006
    Location
    Native Floridian
    Posts
    3,080

    Default

    Andy,

    Losses are to be expected when using dichros to combine different color lasers. Also, you will be loosing a few more percent from each mirror on the x-y scan head. The type of losses you are talking about are way too high. Looking at the photo of your projector, I am a bit puzzled by the optic you seem to be refering to as a "dichro". I'm not quite sure what that is. Here is what a dichro looks like:

    They could also be square in shape and much thinner. You may just want to get rid of that optic and replace it will a good quality optic from Edmunds.

    You may also want to add an IR filter for safety...

    David

  3. #3
    Join Date
    Feb 2005
    Location
    Switzerland
    Posts
    1,370

    Default

    I confirm, way too much loss!
    A good dichro like one from Edmunds, is reflecting >98% and loss 5-10% on transmission.
    And the mirrors of the scanner can loss 5% per mirror, so you should end up with a power like 90mW of green and 175mW of red...
    That's which I'm measuring on my setup.

  4. #4

    Default

    Quote Originally Posted by DZurcher View Post
    Andy,

    Losses are to be expected when using dichros to combine different color lasers. Also, you will be loosing a few more percent from each mirror on the x-y scan head. The type of losses you are talking about are way too high. Looking at the photo of your projector, I am a bit puzzled by the optic you seem to be refering to as a "dichro". I'm not quite sure what that is. Here is what a dichro looks like:

    They could also be square in shape and much thinner. You may just want to get rid of that optic and replace it will a good quality optic from Edmunds.

    You may also want to add an IR filter for safety...

    David
    heres my cheap dichro im using

    http://www.laser-man.co.uk/2006/inde...id=13&Itemid=6

    i found out theres a problem with my power meter
    i mucked it up
    Eat Sleep Lase Repeat


    Aluminium Optic Mounts

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

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