With the application rate of optical fiber laser cutting machine in industrial processing getting higher and higher, enterprises have higher requirements for the stability of equipment operation. In the application of higher power laser cutting machine, some new problems will occasionally be encountered, which will affect the stability of laser processing, such as thermal lens effect.

1、 What is the thermal lens effect?

When the optical elements of the optical fiber laser cutting machine have thermal expansion, sometimes it is caused by the continuous long-term direct radiation of particle beam, sometimes it is caused by poor quality of optical elements, dirt pollution, physical damage and other reasons. The thermal lens effect will change the focus position of laser processing and endanger the actual processing effect. The higher the output power of the laser cutting machine, the higher the laser absorptivity through the optical elements, the greater the temperature rise, the faster the thermal expansion of the optical elements, and the more obvious the thermal lens effect.

These phenomena will eventually cause instability of laser processing and affect the laser processing effect. Next, Longtai Laser mainly analyzes the influence of thermal lens effect on fiber laser cutting machine.

2、 Influence of thermal lens effect on fiber laser cutting machine

(1) Stainless steel cutting: when the optical fiber laser cutter is cutting stainless steel, the thermal lens effect will cause inconsistent cutting surface, more and more slag, and even the problem of continuous cutting.

(2) Carbon steel cutting: when the optical fiber laser cutting machine is used to cut carbon steel, the thermal lens effect will cause more and more slag at the bottom, and the problem of continuous cutting will occur.