Fiber lasers are becoming increasingly popular and are widely used in marking fields due to their reliability, high efficiency and low maintenance costs. However, there is an important material that cannot be marked with fiber laser, and that is glass. The reason lies in the physical properties of glass and its interaction with different wavelengths of light.
Glass is formed through a melting process and is an amorphous, amorphous solid. It transmits visible light well, but does not absorb the infrared spectrum efficiently. Fiber lasers mainly emit 1064nm or 532nm infrared light.
Under these infrared rays, the glass is actually transparent and cannot absorb enough laser energy to cause physical or chemical changes to the surface to form marks or engravings. Some degree of absorption is required to convert the laser's heat or photon energy into material internal energy.
Only in the ultraviolet range can glass produce absorbed laser light, such as 355nm ultraviolet laser, to achieve effective material changes. These wavelengths are absorbed by the glass and can be engraved directly.
There are indeed some smarter ways, such as placing a metal plate on the back of the glass that needs to be marked. After starting the laser, the fiber laser passes through the glass to mark the metal plate. At this time, the metal powder splashed by the metal plate can adhere to the back of the glass. , forming a permanent mark
In short, the wavelength of the fiber laser is too long, causing the glass to behave like a transparent medium rather than an active material. This makes it impossible to mark or engrave on glass, unlike other markable materials. Other non-IR laser technologies need to be considered for permanent marking.
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