The third-generation medium-power single-mode continuous fiber laser ranges from 50W to 1,000W, the new laser has higher electro-optical conversion efficiency (>30%), higher and more stable optical quality, stronger altitude stress-resisting capacity and it applies optimized second-generation fiber transmission system to ensure more stable and more sophisticated cutting effect in thick sheet cutting. This machine applies to many application scenarios: cutting, welding, holing, medical device processing, etc., with a narrow seam of the cut sheet and bright section. Compared with same lasers, it has obvious advantages.