Introduction to the marking principle of UV laser

The wavelength of 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 laser has smaller thermal effect. With the shortening of laser wavelength, various materials have higher absorption rate, Even directly changing the molecular chain structure, ultraviolet laser has obvious advantages when it is used in micro- and nano-scale ultra-fine processing for materials that are sensitive to thermal effects.

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. It can process fine parts. Even at low pulse energy levels, high energy densities can be obtained for efficient material processing and, therefore, more precise marking results.

The working principle of laser marking is to locally irradiate the workpiece with a high-energy density laser to vaporize the surface material or undergo a photochemical reaction of color change, thereby leaving a permanent mark a marking method. 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.

Ultraviolet laser belongs to 'cold light' processing. The water-cooled ultraviolet laser head and power box can be separated. The laser head is small in size and easy to integrate. At the same time, the laser air-cooled heat dissipation aluminum The 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. The UV laser marking machine 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. (Source: Gelai Laser)

As the electronics industry accelerates development, industrial and OEM process technologies are constantly innovating, and traditional processing methods can no longer meet the needs of people With the increasing market demand, UV laser precision laser has the advantages of small spot, narrow pulse width, small thermal impact, high efficiency, environmental protection, and precision machining without mechanical stress. It is an ideal improvement plan for traditional processes.

(This article is edited by the editor, please be sure to indicate the source:)

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