Why does the laser output power drop?

in FAQs about Laser Marking,

After the laser marking machine has been used for a period of time, the reasons for the decrease of the laser output power:

①Whether the laser resonant cavity has changed: fine-tune the front and rear resonator lenses to make the best output spot.

②Whether the all-trans and output diaphragm are defaced.

③Condensation is formed on the surface of the laser bar of the laser marking machine due to the temperature difference.

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