Ultraviolet laser 355nm in the field of precision laser marking

Laser marking technology is one of the largest application areas of laser processing. With the rapid development of the second industry, the application of lasers in various processing and manufacturing industries has become more and more extensive, such as laser marking, laser cutting, laser welding, laser drilling, laser proofing, laser measurement, laser engraving, etc. While accelerating the production of enterprises, it also accelerates the rapid development of the laser industry.

Laser application

The wavelength of the UV laser is 355nm, which has the advantages of short wavelength, short pulse, excellent beam quality, high precision, and high peak power; therefore, it has natural advantages in laser marking. It is not the most widely used laser source for material processing like infrared lasers (1.06μm wavelength). However, both plastics and some special polymers that are widely used as substrate materials for flexible circuit boards, such as polyimide, cannot be finely processed by infrared processing or "thermal" processing.

Therefore, compared with green light and infrared, ultraviolet lasers have smaller thermal effects. With the shortening of laser wavelengths, various materials have higher absorption rates, and even directly change the molecular chain structure. When processing materials that are sensitive to thermal effects, UV lasers have obvious advantages.

The water-cooled laser can provide a 355nm UV laser with an average output power of 1-5W at a repetition rate of 30Khz. The laser spot is small and the pulse width is narrow. High energy density for efficient material processing and therefore more precise marking results.

The working principle of laser marking is to use a high-energy-density laser to locally irradiate the workpiece, so that the surface material vaporizes or undergoes a photochemical reaction of color change, thereby leaving a permanent mark. Like keyboard keys! Many keyboards on the market now use inkjet technology. It seems that the characters of each key are clear and beautiful, and the design is beautiful, but after a few months of use, it is estimated that everyone will find that the characters on the keyboard begin to become blurred. Familiar friends, it is estimated that they can also operate by feeling, but for most people, the fuzzy keys will be in a hurry.

The 355nm UV laser belongs to "cold light" processing. The water-cooled UV laser head can be separated from the power supply box. The laser head is compact and easy to integrate. At the same time, the laser air-cooled heat dissipation aluminum profile is integrated into the laser head, and the heat dissipation energy is good. Marking on plastic materials, with advanced non-contact processing, does not produce mechanical extrusion or mechanical stress, so it will not damage the processed items, and will not cause deformation, yellowing, scorching, etc.; thus, it can be Complete some modern craftsmanship that cannot be achieved by conventional methods.

Through remote computer control, it has excellent application characteristics in the field of special material processing. It can significantly reduce the thermal effect on the surface of various materials and greatly improve the processing accuracy. Ultraviolet laser marking can print various characters, symbols and patterns, etc., and the character size can range from millimeters to micrometers, which also has special significance for the anti-counterfeiting of products.

At the same time as the accelerated development of the electronics industry, the process technology of industry and OEM is also constantly innovating. The traditional processing methods can no longer meet the growing market demand. Ultraviolet laser precision laser has the advantages of small spot, narrow pulse width, small thermal impact, The advantages of high efficiency, saving and environmental protection, precision machining without mechanical stress, etc., are an ideal improvement plan for traditional processes.