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Thread: Trying out high power IR diodes!

  1. #31
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    Quote Originally Posted by VDX View Post
    ... this should be control/loop sensors -- don't know any system fast enough to prevent overpowering with back reflection.

    The "Faraday-isolator" in the kollimator heads of the pulsed fiberlasers works "passive" - it's a nonlinear crystal in a strong magentic field, which is changing the polarisation of the emitting beam, so the evetually reflected beam wont run havoc inside the laser, but reflected to the side on a beam-trap target ...

    Viktor
    Very cool technology, do you have a picture how it looks?

  2. #32
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    ... search for "optical isolator" - https://en.wikipedia.org/wiki/Optica...ndent_isolator

    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

  3. #33
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    Very cool! And expensive!

    I saw a picture on the German forum where you directly etched a copper PCB, what wavelenght/power/pulse rate did you use there? It looks like raster scanning, was it done with galvanometers or X/Y stage?

  4. #34
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    hehe, found this while looking for drivers...20.000W laser drivers, 4x160Amps plus controller very cheap if you are int the US


    https://www.ebay.com/itm/NUVONYX-GLG...dnKLD#viTabs_0

  5. #35
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    Quote Originally Posted by dar303 View Post
    I saw a picture on the German forum where you directly etched a copper PCB, what wavelenght/power/pulse rate did you use there? It looks like raster scanning, was it done with galvanometers or X/Y stage?
    ... this was with a "pulsed" 20Watt fiber-laser and XY-galvoscanners ... here a video removing the paint from a PCB and then burning through the copper to engrave a QR-code

    https://www.youtube.com/watch?v=sxBJtnqhuYw

    Viktor


    *** EDIT *** - for the power -- the "20 Watts" is the averaged power, while the pulse-peak-power is in the range of 10 Kilowatts!
    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. #36
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    Quote Originally Posted by VDX View Post
    ... this was with a "pulsed" 20Watt fiber-laser and XY-galvoscanners ... here a video removing the paint from a PCB and then burning through the copper to engrave a QR-code

    https://www.youtube.com/watch?v=sxBJtnqhuYw

    Viktor


    *** EDIT *** - for the power -- the "20 Watts" is the averaged power, while the pulse-peak-power is in the range of 10 Kilowatts!
    Very nice! What kind of driver for the diode and software for the scanners do you use to produce this?

  7. #37
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    ... this was with a fiber-laser, so as simple, as setting the power and TTL/PWM-pulses to let it burn.

    The controller was an E1701D - http://halaser.de/e1701.php

    Actually I'm programming a similar XY-galvoscanner system with a blue 6W-laserdiode (for engraving foam materials) with one of my own "intelligent" power-drivers, so it's the same TTL/PWM as with the fiber-laser, only changing the actual power is different (setting an analogue voltage and a latch signal) ...

    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. #38
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    Quote Originally Posted by VDX View Post
    ... this was with a fiber-laser, so as simple, as setting the power and TTL/PWM-pulses to let it burn.

    The controller was an E1701D - http://halaser.de/e1701.php

    Actually I'm programming a similar XY-galvoscanner system with a blue 6W-laserdiode (for engraving foam materials) with one of my own "intelligent" power-drivers, so it's the same TTL/PWM as with the fiber-laser, only changing the actual power is different (setting an analogue voltage and a latch signal) ...

    Viktor
    Thank you for the info! I would love to try out some X/Y some day! Is the software expensive?

  9. #39
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    I made some progress again!

    Here is my improvised cutting head and lens holder, the last picture is 100W into a rusty iron ball that I use as beam stop!

    To take it further I will need a proper 50 Amp power supply, cooling for the head, PSU/Driver and a PWM generator and lever converter to test that out before trying to mount it on the CNC! And an oil free compressor with higher pressure.
    Attached Thumbnails Attached Thumbnails Rofinlaser linshċllare v14.png  

    Foto 2020-04-08 13 26 01.jpg  

    Foto 2020-04-09 16 10 10.jpg  


  10. #40
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    Quote Originally Posted by dar303 View Post
    Thank you for the info! I would love to try out some X/Y some day! Is the software expensive?
    ... the software BeamConstruct is free ... but without a valid license it's only running in Demo-mode (or you program your own drivers with the SDK) -- here you'll need one of the controllers with firmware, which act as USB-license-dongle ... I'm using the E1701D-controller - http://www.halaser.de/e1701.php

    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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