How to adjust the decrease in laser marking quality

Possible causes and adjustment methods:
Lens and lens cleaning: Check and clean the lens and lens to ensure they are free of dust or dirt.
Laser power adjustment: It may be necessary to adjust the laser power to ensure that it is strong enough to produce clear markings.
Focus adjustment: Ensure correct focus to obtain clear markings.
Laser maintenance: It may be necessary to replace or maintain the laser.