MOPA marking machine has a very important function, that is the function of blackening alumina. The first is that Apple mobile phones first adopted this technology, and then many domestic mobile phones gradually began to use this technology.
Please see the marking effect
Compared with the general laser marking machine, the outstanding feature of the MOPA marking machine is that the pulse width is adjustable and the frequency range is large.
The pulse width of general laser marking machine is fixed, the range is about 80-120ns, and the frequency is 20KHz-80KHz
MOPA laser marking machine (take IPG’s 20-watt YLPM as an example) pulse width 2-200ns adjustable, frequency 1.6KHz-1000KHz
MOPA laser marking machine has a wide pulse width and a wide frequency range, so there are many combinations of various parameters, and there are many kinds of effects that can be done, and there are many materials and products suitable for use
Three application categories of MOPA laser marking machine
1. Surface stripping application of aluminum oxide sheet
Today’s electronic products are becoming thinner and lighter. Many mobile phones, tablets, and computers use thin and light aluminum oxide as the product shell. When using a Q-switched laser to mark conductive positions on a thin aluminum plate, it is easy to cause deformation of the material, and a “convex hull” on the back, which directly affects the aesthetics of the appearance. The use of the MOPA laser’s smaller pulse width parameters can make the material not easy to deform, and the shading is more delicate and brighter. This is because the MOPA laser uses a small pulse width parameter to make the laser stay on the material shorter, and it has high enough energy to remove the anode layer, so for the processing of stripping the anode on the surface of the thin alumina plate, MOPA Lasers are a better choice.
2. Anodized aluminum blackening application
Using a laser to mark black trademarks, models, texts, etc. on the surface of anodized aluminum materials, this application has gradually been widely used in electronics by electronics manufacturers such as Apple, Huawei, ZTE, Lenovo, and Meizu in the last two years. On the shell of the product, it is used to mark the black mark of the trademark, model, etc. For such applications, only MOPA lasers can process them at present. Because the MOPA laser has a wide range of pulse width and pulse frequency adjustment, the use of narrow pulse width and high frequency parameters can mark the surface of the material with a black effect, and different parameter combinations can also mark the effect of different gray levels.
3. Electronics, semiconductor, ITO precision processing applications
In the precision processing of electronics, semiconductors, and ITO, fine scribing applications are often used. The Q-switched laser is unable to adjust the pulse width parameter due to its own structure, so it is difficult to draw fine lines. However, the MOPA laser can flexibly adjust the pulse width and frequency parameters, which not only makes the scribed line fine, but also the edges appear smooth and not rough.
Is the working efficiency of MOPA laser marking machine really faster than ordinary laser marking machine? (20W as an example)
1. For deep metal engraving, mopa laser marking machine may not have the advantage, because there is no advantage in single pulse energy, but in terms of fine effect, it is much better than ordinary marking machines.
2. In general marking tasks, because the peak value and frequency of MOPA laser marking are high, even if the marking speed is doubled, it can maintain a relatively good spot overlap. The general marking machine is powerless. The frequency limit of the general marking machine is only 80KHz, and the peak power of increasing the frequency drops very severely, and the marking effect cannot be achieved.
Interpretation of MOPA laser power reduction meter
Each mopa laser will have a power reduction meter, please refer to this table to adjust the parameter combination. Otherwise, it is blind adjustment without direction.
Each pulse width has a corresponding power reduction frequency. At this frequency, the frequency parameter will cause the actual power to be lower than the set power. The frequency parameter on the reduced power frequency will cause the actual power to be equal to the set power, but the peak power becomes smaller. When the frequency is equal to the power reduction frequency, the power is the set power, and the peak power is the maximum.
needs a strong laser, then select the long pulse width and low frequency laser parameters
Alumina black is generally selected for short pulse width and high frequency laser parameters
can use short and medium pulse width processing as much as possible to use short and medium pulse width, because their lower power frequency is relatively high, can increase the processing speed. And the effect is more even and delicate.
The advantages of mopa laser marking machine
1. Flexible control, independently adjustable pulse width and frequency
2. Pulse shape is controllable
3. Large adjustable range of parameters
4. Strong system upgradeability
MOPA laser recommendation
British spi
The MOPA laser I know
IPG
The MOPA laser I know
JPT
