As we know,laser source is main parts of fiber laser cutting machine,which has a great influence on the cutting effect. So when we chose fiber laser cutting machine,that is necessary to consider the module integration of laser source.
The module composition of laser source is divided into single mode and multimode. In the cutting application, the focus spot has a great influence on the quality of the cut. The core of the single mode laser is relatively thin, the beam quality is better than multimode. And the energy distribution Gaussian distribution with the highest intermediate energy density,the three-dimensional map is a sharp mountain peak.
The core of a multimode laser is coarser than that of a single mode. The energy distribution is smaller than that of a single mode. The three-dimensional image is an average of a single-mode spot. The three-dimensional image is an invert cup. From the edge steepness, the multimode ratio The single mode is steep.
1mm thin plate cutting speed single mode is 20% higher than multimode. the visual effect is similar. But from 2mm, the speed advantage is gradually reduce. Starting from 3mm, the speed and effect of high power multimode laser are very obvious.
Therefore, the advantage of single mode is thin plate. The advantage of multimode is thick plate. Single mode and multimode are not compare with each other. They are all a configuration of fiber laser. It is like a car. The car is suitable for highway and off-road suitable for mountain. However, the car can also run the mountain, the off-road can also run the road, so the choice of multi-mode or single-mode fiber laser depends on the actual end-user processing needs.
Single mode and multi mode, how to choose?
The laser of 1000W or less is mainly due to its low energy, and the thickness of the main processing material is bias toward the thin plate. Therefore, the single-mode configuration of the laser within 1KW is in line with the actual market conditions. And the laser with a power of 1KW or more should be thin and thick. From the perspective of the entire processing industry, the improvement of processing quality is a rigid demand, which cannot be compromised. Therefore, many high-power lasers will not consider single-mode, and the processing quality must be the first!
At the same time, the single-mode core is generally thin. Meaning that the laser of the same power is transmitted in it, and the light energy carrying capacity of the single-mode core is larger, which is a test for materials. At the same time, when cutting high-reflection materials, the high-intensity reflected light and the emitted laser are superimposed. If the tolerance of the fiber material is insufficient, it will be very easy to “burn the core”, and the life of the core material is also a challenge! Therefore, many laser manufacturers are high. The configuration of the power fiber laser still uses a multi-mode configuration!