Laser: beam quality, pulse width, pulse frequency and single pulse energy.
Vibrating mirror: the difference between digital vibrating mirror, analog vibrating mirror and analog digital vibrating mirror, scanning speed of vibrating mirror, coated lens, motor and so on.
Lens: lens scanning format, coated lens, etc.
Beam expander: beam expander, coated lens, etc.
These are the optical parts that affect the stability of the laser marking machine, and also have some influence on the parameter setting of the control software, the stability of the software and the control computer, but they are not the main factors.
More specifically, it is a short essay mode. If you really want to buy it, you can link to the website.