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Thread: Pumping yag and YVO4 at 888nm

  1. #1
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    Default Pumping yag and YVO4 at 888nm

    Just thought I'd share this article that was just published.. perhaps it's old news to some but:
    https://www.laserfocusworld.com/lase...avelength-pump

    In short: Higher DPSS efficiencies are obtained using 888nm diode bars rather then the 808nm that's normally being used.

  2. #2
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    ... now only to find proper dieode bars

    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. #3
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    Quote Originally Posted by VDX View Post
    ... now only to find proper dieode bars

    Viktor
    Coherent sells them.. but I fear because it's new the cost will be high.. maybe they will come down.. I wonder if the process of making them is that much more different.

  4. #4
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    ... if this would be for 975nm-diodes -- here I have some (maybe 5) Kilowatts in pumping diodes

    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
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    What do you use 975nm for? do you use it directly as a source for engraving??

  6. #6
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    ... yes - fibercoupled diodes with 5, 9, 25 and 30 Watt through a 105µm-fiber refocussed to a spot of 0.1mm (or "bundled", then a spot of roughly 0.2 to 0.3mm, but X-fold power) ... or other types with 200W and 270W through a 0.2mm fiber oder direct focussed

    For "fine-work" I'm using fiber-lasers (CW up to 130W, pulsed with 30W averaged) - you can see some of them in this thread - https://photonlexicon.com/forums/sho...ng-and-marking

    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

  7. #7
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    Good luck pumping Nd with 976nm

    The real way forward is to abandon Nd all together -- Yb: fiber is where it is all at. I have observed over 80% optical-to-optical efficiency from 976nm to 1064nm

  8. #8
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    ... I'm not using the 975nm diodes for pumping, but for "direct diode" material processing

    With powers of 270Watts on a 0.2mm-spot even a single diode has enough power for cutting thin metal sheets or laser-welding.

    Several of them, "combined" into a single spot of around 0.5 to 1mm, but powers of some kilowatts would be somehow "overdosed" ... but maybe worth, testing for the possibilities in direction of high-speed-welding (á la "metal-spitting") or SLS

    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

  9. #9
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    Is the output still 1064? Thinking 888 would yield 572 when doubled.

  10. #10
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    ... couldn't find a second number, so the article seems to focus only on replacement of the typically used 808nm by 888nm for pumping Nd to 1064nm output.

    The 888nm have a lover absorption rate, so can penetrate deeper, what gives a longer "pumping volume" ... no mention of output vavelength change or such ...

    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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