Beam focusing optics
Beam focusing minimizes the beam diameter in laser cutting to achieve high power density. Accurate focus position is critical for a clean cut.
Physical-Chemical Working Mechanism
Beam focusing uses lenses or mirrors to minimize the beam diameter of a laser. This increases the power density of the beam at a single point, which improves the efficiency and precision of the processing.
Metallurgical Relevance & Welding Risks
An inaccurate focus position can lead to uneven material evaporation, resulting in irregular cuts or even cracks in the workpiece. In addition, too high a power density can alter the material by affecting its chemical properties.
Shop Practice & Action Steps
To ensure clean focusing, the lenses or mirrors must be checked and cleaned regularly. The focus position should be set using a special measuring device that determines the optimal distance to the workpiece. A typical power density is 100 kW/cm² for metal working.