Shaanxi Cutting Locomotive Workshop

Due to manufacturing costs and other reasons, civilian laser generators emit laser beams with a certain divergence angle, forming a "cone" shape. When the height of the "cone" changes (equivalent to a change in the optical path length of a laser cutting machine), the cross-sectional area of the beam on the surface of the focusing lens also changes accordingly. In addition, light also has wave like properties, so diffraction phenomena inevitably occur, which cause the beam to expand laterally during propagation. This phenomenon exists in all optical systems and can determine the theoretical limits of their performance. Due to the conical shape of Gaussian beams and the diffraction effect of light waves, when the length of the optical path changes, the diameter of the beam acting on the lens surface constantly changes, which can cause changes in the size and depth of the focal point, but has little effect on the focal position. If the size and depth of the focal point change during continuous processing, it will inevitably have a significant impact on the machining process, such as causing inconsistent cutting seam widths, inability to cut through or burn the plate under the same cutting power, etc