The problem of shallow drilling of laser marking machine is summarized as follows:

1. The optical path is biased. Adjust the light path to the best state again with frequency multiplier.

2. When the lens is dirty, dip a cotton swab in alcohol and gently scrub YG end face, front mirror, beam expander and focusing mirror.

3. Increase the laser power supply current of the laser marking machine and reduce the frequency of the marking machine.

4. Reduce the marking speed and change the filling method. And whether the workpiece is in focus.