When sourcing a 1kw fiber laser, the laser source brand (such as Raycus, MaxPhotonics, or IPG) is critical as it determines the stability and lifespan of the beam. You must verify the cutting capacity, which for 1kw typically handles carbon steel up to 10-12mm and stainless steel up to 4-5mm. Additionally, check the motion system accuracy (look for ±0.03mm or better) and the quality of the servo motors (e.g., Yaskawa or Delta) and linear guides (e.g., HIWIN) to ensure long-term mechanical precision.