Understanding Fiber Laser Frequency — Explanation + Real Engraving

Justin Laser

Justin Laser

98,119 views

What does frequency actually do on a fiber laser? In this video, I break down the frequency setting in LightBurn using simple examples, then engrave brass coins at 48, 80, and 200 kHz to compare the results.

We’ll cover pulses per second, pulse energy, pulse overlap, and the frequency ranges available on MOPA and non-MOPA lasers. You’ll see how different frequencies affect surface texture and detail—and why this experiment changed the settings I use for my own coins.

🔥 LEARN FIBER LASER ENGRAVING WITH LIGHTBURN — FREE
If you’re learning what all these settings mean, my free Fiber Laser Ignite course is a great place to start. We cover fiber laser settings, LightBurn basics, common laser processes, and 9 guided projects—with downloadable project files so you can follow along.

Watch the complete course for free: https://fiberlaserignite.com

💡 TRY LIGHTBURN FREE FOR 30 DAYS
LightBurn is the software I use to set up and run the engraving tests in this video. Get the free 30-day trial here:
https://www.lightburnsoftware.com/jus...

⚡ THE FIBER LASER I USE
60W JPT MOPA from OMG Laser: https://geni.us/fiber-laser-for-metal
Save $100 with code OMGJL.