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The difference and application advantages of MOPA laser and Q-switched laser

In recent years, domestic fiber laser marking technology has developed rapidly, and it has been widely used in electronic 3C products, machinery, food, packaging and other fields. Compared with traditional marking technology, laser marking technology has more advantages not only in material loss, but also in marking effect. In order to obtain a more beautiful marking effect and more efficient production and processing, people will choose different manufacturers and types of lasers on the market for comparison, so as to find the laser suitable for processing such products.

At present, the types of pulsed fiber lasers used in marking on the market mainly include two types: Q-switching technology and MOPA technology. Q-switched lasers were introduced into China a few years ago, so they currently occupy a large processing market. The MOPA laser has only been gradually developed in recent years. As a newer technology, what is the difference between the MOPA laser and the Q-switched laser? What new technologies and advantages does it have?

The marking application difference between MOPA laser and Q-switched laser.

1. Application of surface stripping of alumina sheet

Today’s electronic products are getting thinner and lighter, and many mobile phones, tablets, and computers use thin and light alumina as the outer shell of the product. When using a Q-switched laser to mark conductive potential on a thin aluminum plate, it is easy to cause deformation of the material, and a “convex hull” is generated on the back, which directly affects the aesthetics of the appearance. The parameters of the MOPA laser with a smaller pulse width can make the material not easily deformed, and the shading will be more delicate and brighter. This is because the MOPA laser uses a small pulse width parameter to make the laser stay in the material shorter, and the energy is high enough to remove the anode layer, so for the process of stripping the anode on the surface of the thin aluminum oxide plate, MOPA Lasers are a better choice.

2. Anodized aluminum blackening application

Use laser to mark black trademark, model, text, etc. on the surface of anodized aluminum material. This application has gradually been widely used in electronic product casings by Apple, Huawei, ZTE, Lenovo, Meizu and other electronics manufacturers in the past two years. , used to mark the trademark, model, etc. of the black mark. For such applications, currently only MOPA lasers can process them. Since the MOPA laser has a wide range of pulse width and pulse frequency adjustment, the parameters of narrow pulse width and high frequency can be used to mark the black effect on the surface of the material, and different grayscale effects can also be marked by different parameter combinations.

3. Electronics, semiconductor, ITO precision processing applications

In precision processing such as electronics, semiconductors, and ITO, fine scribing applications are often required. Due to its own structure, the Q-switched laser cannot adjust the pulse width parameters, so it is difficult to make fine lines. Since the MOPA laser can flexibly adjust the pulse width and frequency parameters, it can not only make the scribed lines fine, but also make the edges smooth and not rough.

In addition to the above application cases, there are many different application differences between MOPA lasers and Q-switched lasers. Some typical application cases are listed here, as shown in the following table:

In the above introduction and comparison, it can be seen that MOPA lasers can replace Q-switched lasers in many applications. In some higher-end applications, MOPA lasers are even better than Q-switched lasers.

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