1, output power of fiber laser. The unstable output power of fiber laser will affect the spot of fiber laser cutting machine. However, in the actual cutting process, some manufacturers will adjust the light spot as small as possible in order to improve the machining accuracy.

2. Laser diffraction phenomenon. Because the light of laser cutting machine is fluctuating, diffraction often occurs. This phenomenon exists in many optical systems, and the theoretical limit of performance of these systems can be determined. If an "ideal" lens is used to focus a collimated laser beam, the spot size will only be affected by diffraction.