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Thread: Trying out high power IR diodes!

  1. #1
    Join Date
    Dec 2007
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    Stockholm, Sweden
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    Default Trying out high power IR diodes!

    Hi,

    Thanks to the very patient and informative VDX/Viktor I got started in high power IR!
    I managed to snag a very cheap Rofin 976nm 300W CW module off eBay and bought a Meanwell driver for it (50Amps).
    Then I removed the fibre coupler and the associalted optics and hooked it up to the driver and a 30V, 13A power supply I had laying around.
    It actually lased on the first try but I only got two lines so I might have a couple of broken diodes or they were still below lasing treshold.

    My power supply did not take this beating very well and died on me so I will upgrade and try to make som more tests. I also have 1064nm focus optics in the mail but it might take a while due to the virus.
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  2. #2
    Join Date
    Dec 2007
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    Stockholm, Sweden
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    Default

    Here is a link to the driver I used, pretty good price for the specs. It can be modulated/PWM:ed to 5kHz or run CW.

    https://www.distrelec.biz/en/laser-d...=10&track=true

    I´m thinking about what power supply to use, the driver data sheet is a bit sparse with information, the specs says "12-60V" but not much more.
    https://www.distrelec.biz/Web/Downlo...f?pid=30159466

    This is a constant current supply, will I gain something for using higher voltage or will that just translate to higher heat loss?
    Attached Thumbnails Attached Thumbnails Skärmklipp.JPG  


  3. #3
    Join Date
    Mar 2015
    Location
    Cambridgeshire, England
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    Default

    The combiner optics look interesting, are they just plain glass or do they have a mirrored coating?

  4. #4
    Join Date
    Oct 2012
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    Germany
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    Default

    ... they are coated for the specific wavelength (mostly 808nm or 975nm).

    Here you can see some of my high power diodes with similar buildup - https://photonlexicon.com/forums/sho...-marking/page8

    Viktor
    Aufruf zum Projekt "Müll-freie Meere" - https://reprap.org/forum/list.php?426
    Call for the project "garbage-free seas" - https://reprap.org/forum/list.php?425

  5. #5
    Join Date
    Dec 2007
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    Stockholm, Sweden
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    Default

    I also took inventory of my CO2-laser stash and I think I have been hoarding a bit too much! Managed to buy some on ebay for about 150 USD a piece lately, maybe time to unload some now? I will try to trade some for a small CNC lathe I think.
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  6. #6
    Join Date
    Dec 2007
    Location
    Stockholm, Sweden
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    Default

    Ok, found a 12V 32,5A server power supply and hotwired it a bit to run. I also got out my Scientech 100W laser power meter and with this voltage I get about 100W max.
    The current measurement output of the driver is shows about 0.1 volts per Watt.
    It still looks like two of the diodes are broken, they seem to draw current since they are connected in series but I get only two lines on the sensor. (RIP sensor coating!)
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  7. #7
    Join Date
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    Germany
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    ... make a photo with the diodes working (maybe add some smoke to see the beams) - you should be able to see them emitting (or not) ...

    Viktor
    Attached Thumbnails Attached Thumbnails JOLD_25W@808nm-8A.jpg  

    Aufruf zum Projekt "Müll-freie Meere" - https://reprap.org/forum/list.php?426
    Call for the project "garbage-free seas" - https://reprap.org/forum/list.php?425

  8. #8
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    My iPhone 6 doesn't show it at all, even at a 50 Watts with the lights on at least! I have to try another camera.
    Is your diode 808nm?
    Attached Thumbnails Attached Thumbnails Foto 2020-03-28 22 40 08.jpg  

    Last edited by dar303; 03-28-2020 at 14:04.

  9. #9
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    Dec 2007
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    Ok, my kids phone on night mode showed a decent pic!
    It looks like all four emitters are on, strange that they show up as two bars!
    Attached Thumbnails Attached Thumbnails IMG_0429.jpeg  

    Last edited by dar303; 03-28-2020 at 14:01.

  10. #10
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    ... block the single emitters (with some heat-resistant, not reflecting material, like a tile piece) and examine changes in the resulting beam ...

    Viktor
    Aufruf zum Projekt "Müll-freie Meere" - https://reprap.org/forum/list.php?426
    Call for the project "garbage-free seas" - https://reprap.org/forum/list.php?425

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