Two types of fiber laser markers are Q-switched technology and MOPA technology. Q switching is a method for making a laser emit short pulses of light. MOPA (Master Oscillator Power Amplifier) is a method of amplifying the output of a small laser (master oscillator). They are two different things.
Q-switched fiber laser markers have been appeared years earlier, so they currently keep a large share of the market. MOPA fiber laser markers are developing gradually in recent years. The major difference between MOPA lasers and Q-switched lasers is that MOPA laser can adjust the pulse width and frequency parameters flexibly, which allows to make finer structures, intricate details, smooth edges, and color graphics.
Application differences between MOPA laser marking and Q-switched laser marking.
Surface stripping of aluminum oxide sheet
Many mobile phones, tablets, and computers use light-weight aluminum oxide as the outer shell of the product. When a Q-switched laser is used to mark conductive sites on a thin aluminum plate, it can easily cause deformation of the material and convex bulges on the back side, which directly affects the aesthetic appearance. With the use of the MOPA laser’s small pulse width parameters, it can make the material not easily deformed, and the shading is more delicate and bright. This is due to the MOPA laser’s use of small pulse width parameters that allow the laser to stay in the material for a shorter period of time, but also have enough energy to clear the anode layer. So for the thin aluminum oxide plate surface stripping anode processing, MOPA lasers are a better choice.
Anodized aluminum black marking
The laser is used to mark the black trademark, model, and text on the surface of the anodized aluminum material. For this application, only MOPA laser can process it at present. Because the MOPA laser has a wide range of pulse width and pulse frequency adjustment, the narrow pulse width and high frequency parameters can be used to mark the surface of the material as black. Different combinations of parameters can also be used to mark different gray levels.
Electronic, semiconductor, ITO precision machining
In precision machining of electronics, semiconductors, and ITO, fine line application is often required. Q-switched lasers cannot regulate the pulse width, so it is difficult to fine-tune the line drawn. The MOPA laser can adjust the pulse width and frequency parameters flexibly, which can not only make the line drawn fine, but also the edges appear smooth and not rough.