Here we see the knife aligned in the engraver, which looks a lot like a flatbed plotter with a cover on it. The blade has been sprayed with a coating that will blacken the "crater" in the steel, making the marking visible. The visible red laser dot is used for alignment. Engraving is done by an invisible high-power infrared laser beam.
Actual engraving took only a few seconds, and I could not get a good picture of it. The lettering blazed like an arc welder, but with white light instead of blue. I thought about the words on The Ring, which only were visible in fire. But our message is much friendlier.
All that was needed after that was to wash off the rest of the spray, and the knife was done.