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Thread: Trying out high power IR diodes!

  1. #41
    Join Date
    Dec 2007
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    Stockholm, Sweden
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    A bit quiet from me here lately, I did not burn down the house but I had to get some new stuff to take this up a notch!
    I got a 12V 60A power supply, some 1064nm optics that should work and a 0-3kW (!) laser effect sensor!
    The stuff will start to arrive in the coming days, already got the PSU!

  2. #42
    Join Date
    Dec 2007
    Location
    Stockholm, Sweden
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    Argh, disaster struck!

    After connecting a new 12V, 60A power supply to the old driver and putting the new sensor in front I slowly turned it up but the laser never got over 100W!
    Then I noticed a strange pattern in the output, it looks like a large amount of emitters have stopped lasing! The PSU is a quality Meanwell supply, the same as the driver and I did not have any loose connections or anything that could have destroyed the diodes. Maybe some kind of turn on transient or power anomaly? We had some thunderstorms but everything else here still works.
    I still get 100W or so but the power is not uniform, I guess it can still be used with the right optics but it is a bit of a bummer to say the least!

    So hit me up if you have some high power diodes to sell or trade for Synrad 48-1 or maybe a small 488nm argon?

  3. #43
    Join Date
    Oct 2012
    Location
    Germany
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    1,478

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    ... hmmm ... do you modulate the power by voltage set or with a reliable constant-current-driver?

    When swiching/modulating with only a PSU, then you'll get heavy transients when switching on/off without slow decay --- tested a "proffessional" driver, which run havoc when the current was above a specific limit - when below 5Amps, all was OK ... above 5.5Amps ther were "oscillations" or transients with up to +90Amps or -40Amps with some ten Nanoseconds pulse durations!!

    Had to develop my own constant-current PWM capable regulators/drivers, switching some ten Amps with up to 100 kHz without transients ...

    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

  4. #44
    Join Date
    Feb 2019
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    91

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    I have a similar laser diode but at the output has a water cooled coupler with optic fiber
    that collimates and transfers the beam.
    It outputs mutlimode beam (2 horizontal lines) that is much worse than fiber lasers.
    Generally all diode lasers have bad beam quallity
    and beam quallity is very important for engraving/cutting applications.
    The other end of optic fiber is cut with scissors and with beam 1'' / 10amperes burns the fiber.
    I have ordered diamond lapping papers to do lapping to the fiber and i will test again.
    But i don't believe that this will cut metalls due to bad beam quallity diode lasers have.
    What focus lens can i try with this diode laser?
    If i use focus lens optic fiber is needed or not?

  5. #45
    Join Date
    Oct 2012
    Location
    Germany
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    1,478

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    ... with my DIY-fibers with 0,4mm diameter I've got max. output power below 100 Watts and best spot at roughly 0,5mm diameter (but perfect round!).

    When direkt focussing with a lens suited/ARcoated for NIR, I've got full power and a spot diameter below 0,2mm (with bigger lens and shorter focal distance maybe even 0,1mm).

    Attached some samples of testing with half power (100Watts) on ceramic tiles and stainless steel ...

    Viktor
    Attached Thumbnails Attached Thumbnails Fliese-Megapuls-OK.jpg  

    04_800x400.png  

    53_800x400.png  

    b9_800x400.png  

    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

  6. #46
    Join Date
    Feb 2019
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    91

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    How thick is the ss sheet ? The hole is done with compressed air/N2 support or with laser alone ?
    Does this diode laser needs faraday optoisolator or not ?

  7. #47
    Join Date
    Oct 2012
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    Germany
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    ... the ss piece is 3mm thick -- the "shots" were only made for measuring smallest focus diameter - all three with same power, but different pulse-length ... and without shielding gas.

    The "power" of this diodes can be seen here, while heating on/through a tile (with half power only!):

    https://www.youtube.com/watch?v=nVsZ07bP-AM

    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

  8. #48
    Join Date
    Feb 2019
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    91

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    impressive..
    What focus lens you used ?

  9. #49
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    Oct 2012
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    Germany
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    ... this was a "provisorium" with a random found achromate, which has 35mm diameter and 58,2mm FL - but no AR-coating, so won't use it for full power.

    In the end I'll use a smaller lens with NIR-coating from Thorlabs -- will make a photo, when in the other house again (where I'm actually moving my "laser-base") ...

    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

  10. #50
    Join Date
    Feb 2019
    Posts
    91

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