The RFH 532nm green laser performs brilliantly in the processing of micro-hole groups of thin aluminum plates

High-decibel sound is obvious to people's work and life, and the application of materials with sound absorption, sound insulation and noise reduction properties is more and more common. With a wide range of sources and strong plasticity, perforated thin aluminum sheets have become the best choice for current sound insulation and noise reduction materials.

However, it is not easy to achieve high-quality thin aluminum plate microporous group processing. Although the traditional machining method has mature technology, it has more or less low processing efficiency, non-smooth holes, relatively large taper, and post-grinding processes, which cannot meet the current high-precision requirements.

With the advantages of non-direct contact, high efficiency, energy saving, and easy system integration, laser processing has become one of the indispensable and widely used processing methods in the processing of small holes and micro holes in aluminum materials. The drilling principle is that in a very short time, the laser with high energy density interacts with the aluminum material, and the energy is absorbed by the aluminum material and converted into heat energy. When the laser power density reaches the order of 106W/cm2-107W/cm2, the aluminum The surface of the material absorbs laser energy so that the temperature rises sharply to the vaporization temperature and strongly vaporizes, and plasma is generated at the same time. Under the action of vaporization expansion and plasma pressure, the molten material in the hole evaporates and sprays outward, thereby forming small pits in the substrate. As the laser irradiation makes the pit larger and deeper, it eventually penetrates the thin aluminum material to become a perforation.

Since aluminum has the characteristics of high reflectivity and good thermal conductivity, and aluminum has a very low absorption rate of laser light near the wavelength of 10um, green laser can be used for aluminum processing. At the same time, the pulse width is a crucial factor that must be considered in the field of laser micromachining. In a nutshell: the narrower the pulse width, the lower the damage threshold to the aluminum material, the smaller the hole taper, the better the roundness, the less molten material in the orifice and the hole wall, and the less sputtering particles around the orifice.

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The green lasers produced by RFH fully meet the needs of aluminum perforation processing. One is the output 532nm green laser with an average output power of 40W, which is highly compatible with aluminum plate processing. Second, the pulse width is small (<25ns@100kHz). The third is the high quality of the laser beam, the diameter of the focused spot is micron, and the energy density is high. The array drilling method can be used for efficient and dense drilling to realize the processing of micro-hole groups. Fourth, the unique resonant cavity design ensures the stability under high power and high repetition frequency, which is especially suitable for industrial integration application requirements.