Fiber laser cutting machine single mode and multiple mode

Fiber laser source is the core component of laser cutting machine, which has great influence on cutting effect of laser cutting machine. When selecting laser cutting machine, we must consider what kind of module integration mode of fiber laser.

The module composition of fiber laser can be divided into single mode and multiple mode. In cutting application, focusing spot has a great influence on the quality of cutting, the Single-mode laser source have thin laser cores, the laser beam quality is better than multiple mode. As can be seen from the energy distribution diagram, the middle energy density is the highest, and the distribution of the whole energy is like a peak with a sharp circle.

The laser core of a multiple mode laser source is thicker, the laser beam has a lower mass than a single mode, and the energy distribution is a little bit more average than the single mode speckle. So the energy distribution diagram like an inverted cup. In terms of edge steepness, multiple mode is much steeper than single-mode.




The single-mode cutting speed of 1mm thin plate is 20% higher than that of multiple mode.The effect of cutting is similar. But from 2mm plate, the speed advantage of single mode decreases gradually. From 3mm plate, no matter the cutting speed and the cutting effect. The advantages of high power multiple mode lasers in cutting speed and cutting effect are obvious.

So the advantage of single mode is in thin plate, multiple mode advantage in thick plate. Single mode and multiple mode are not worth comparing with each other. They are the configuration of fiber laser cutting machine. It's like a car, the car is suitable for highway, The SUV is suitable for mountain. But cars can also run in the mountains, The SUV can also run on the highway. So, the choice of multi-mode or single mode of fiber laser depends on the processing requirements of the actual end customers.


How to choose the single mode and multiple mode?

From different power, Laser source power within 1KW, because the energy itself is not high, The main material for processing is sheet metal, so within 1KW laser power, the single mode configuration of laser source is more in line with the actual market situation. Laser power above 1KW, in the whole processing industry, they pursue the quality of processing, So, many high power laser source do not use single mode into account.

At the same time, the fiber core of single mode is generally finer, that means the same power of the laser is transmitted in it. The light energy load of single-mode fiber core is larger, It's a test for the material. Also when cutting high reflection materials, the high-intensity reflected light is superimposed with the laser beam, this will be damage the laser core. So, many laser manufacturers still choose multi-mode in the configuration of high power fiber laser.

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