60w MOPA white parameter settings

LightBurn Hardware Compatibility Galvo
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1

Hi everyone,

I recently upgraded from a 20W MOPA fiber laser to a 60W MOPA (JPT source) and I’m trying to get my settings dialed back in, especially for white marking / white engraving on stainless steel.

On my 20W setup I had decent results, but with the 60W everything is acting differently and I’m struggling to get that clean bright white finish. Right now my marks are still coming out more grey/black instead of white, even when I adjust power.

What I’ve tried so far:

  • Adjusting power down significantly
  • Changing speed settings
  • Playing with frequency (I can now adjust it, but not sure what range is ideal for white)
  • Testing different passes
  • Adjusting hatch/line interval in LightBurn

What I’m unsure about:

  • Ideal frequency range for white marking on stainless with a 60W MOPA
  • Recommended pulse width settings (if applicable for this type of marking)
  • Whether I should be using defocus for better oxidation control
  • Best combination of speed / power / frequency for a clean white finish
  • If 60W requires completely different approach compared to 20W for this effect

In LightBurn I also noticed some settings like pulse width/global passes behaving differently than expected, so I might be missing something in the device setup as well.

If anyone has a working parameter set for white marking on stainless steel with a 60W MOPA, I’d really appreciate if you could share it or point me in the right direction.

Thanks in advance

2

No one can give you settings that work with every type of MOPA even if they are the same. There seems to be too much variance between them somewhere.

Commarker as settings for doing white on stainless (section 4, I think).

There is also a similar document from Thunder, lots of settings, ensure you’re in the Fiber group.

The real difference between the two machines is that the fiber can pump up 3 times faster with a 60W over a 20W. So I’d look at your speeds, q-pulse and frequency. If the 20W was a MOPA also, it can produce less power if you below the threshold of q-pulse and frequency.

This is my 60W JPT M7 MOPA manual.

JPT also have an interesting video on how the fiber is used as an amplification medium.

If you have the same source, then it’s information should apply. You can find threshold values in the manual.

:grinning_cat:

3

Lasertips.org may also be useful to point you roughly in the right direction:

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