The difference between optical fiber and ultraviolet laser marking machine

Fiber laser

　　 Fiber pulse laser is a kind of laser produced by using glass fiber doped with rare earth elements (such as ytterbium) as the gain medium. It has a very rich luminous energy level. The pulsed fiber laser has a wavelength of 1064nm (the same as YAG, except that the working material of YAG is neodymium) (the typical wavelength of QCW and continuous fiber laser is 1060-1080nm. Although QCW is also a pulsed laser, its pulse generation mechanism is completely different. The same, the wavelength is different), is a near-infrared laser.

It can be used to mark metal and non-metal materials, because the absorption rate is high.

　　 fiber laser marking machine is realized by using the thermal effect of laser on the material, or by heating and vaporizing the surface material to expose the deep layer of different color material, or heating the surface of the material by light energy Microscopic physical changes (for example, some nano- or ten-nanometer micro-holes will produce a black body effect, and very little light can be reflected, making the material appear dark), which causes a significant change in its reflective performance, or heating by light energy When certain chemical reactions occur at the time, the required graphics, characters, two-dimensional codes and other information are displayed.

　　UV laser

　　Ultraviolet laser is a short-wavelength laser. Generally, frequency doubling technology is used to convert the infrared light (1064nm) emitted by the solid-state laser into 355nm ( Triple frequency), 266nm (quadruple frequency) ultraviolet light.

The photon energy is very large, which can match the energy levels of some chemical bonds (ionic bonds, covalent bonds, metal bonds) of almost all substances in nature, and directly break the chemical bonds, causing the material to undergo a photochemical reaction without obvious Thermal effects (some energy levels of the nucleus and inner electrons can absorb ultraviolet photons, and then transfer the energy through lattice vibration, resulting in a thermal effect, but it is not obvious), which belongs to 'cold working'.

Because there is no obvious thermal effect, UV lasers cannot be used for welding, and are generally used for marking and precision cutting.

　　The process of UV laser marking machine is realized by the photochemical reaction between UV light and the material, which causes the color to change. Appropriate parameters can avoid the obvious removal effect on the surface of the material. You can mark graphics and characters without obvious tactile feeling.

　　 Although UV lasers can mark both metals and non-metals, due to cost factors, fiber lasers are generally used to mark metal materials, while UV lasers require high surface quality and CO2 laser marking. Products that are difficult to achieve with the standard machine form a high-low match with CO2.

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