What is the reason that the output power at the laser outlet is sufficient, but the power at the terminal of processing is very low?

This situation is generally caused by the presence of high energy loss in the external optical path of the laser. 

Users should check the following points:

Whether the size of the lenses of the external beam path and the size of the aperture of the beam passage is large enough.

1. Whether the quality of the lenses of the external beam path is qualified, and the loss of a single lens cannot exceed 3%

2. Whether the lenses of the external light path are polluted or damaged.

3. Whether the external beam path has been correctly aligned.