Views: 12 Author: hu Publish Time: 2021-09-19 Origin: dapeng
The fiber laser is the core component of the laser cutting machine, which has a great influence on the cutting effect of the laser cutting machine. When choosing a laser cutting machine, what is the module integration mode of the fiber laser need to be considered?
The module composition of fiber lasers is divided into single-mode and multi-mode. In cutting applications, the focused spot has a great influence on the quality of the cut. The core of single-mode lasers is relatively thin, and the beam quality is better than that of multi-mode, and the energy distribution It has a Gaussian distribution, with the highest energy density in the middle, and the three-dimensional image is a sharp round mountain peak.
The core of the multimode laser is thicker than that of the single mode, and the beam quality is worse than that of the single mode. The energy distribution is more average than that of the single mode. The three-dimensional image is an inverted cup. From the perspective of the steepness of the edge, the ratio of multimode is Single mode is much steeper.
Comparison of 1.5KW single-mode and 1.5KW multi-mode lasers with the same power
The cutting speed of 1mm sheet is 20% higher than that of multi-mode single-mode, and the visual effect is almost the same, but starting from 2mm, the speed advantage gradually decreases. Starting from 3mm, whether it is speed or effect, the speed and effect of high-power multi-mode lasers are very obvious. Reflected, as shown below:
Therefore, the advantage of single-mode lies in thin plates, and the advantage of multi-mode lies in thick plates. Single-mode and multi-mode have no mutual value. They are both a configuration of fiber lasers, just like a car. A car is suitable for roads and off-road is suitable for mountains. , But cars can also run on mountains, and off-road can also run on roads, so whether fiber lasers choose multi-mode or single-mode depends on the actual end customer's processing needs.
How to choose between single-mode and multi-mode?
From the perspective of power level distinction, because of the low energy of lasers within 1000W, the main processing material thickness is biased towards thin plates. Therefore, the single-mode configuration of lasers within 1KW is more in line with the actual market situation. Lasers with power above 1KW should be thin and thick. . From the perspective of the entire processing industry, the improvement of processing quality is a rigid requirement and cannot be compromised. Therefore, many high-power lasers do not consider single-mode in the selection of high-power lasers. It is necessary to ensure that the processing quality is the first!
At the same time, single-mode fiber cores are generally thinner, which means that the laser of the same power is transmitted in it, and the light energy carrying capacity of single-mode fiber cores is larger, which is a test for materials. At the same time, when cutting high-reflective 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". At the same time, it is also a challenge to the life of the core material! Therefore, many laser manufacturers are in high The multi-mode configuration is still used in the configuration of the power fiber laser!