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Crystal laser engraving principle

Jul 16, 2018

Crystal and Glass crafts are made with a computer-controlled laser engraving machine. In fact, most of the crafts usually seen are not real crystals, but artificial crystals. “Laser” is the most useful tool for “inside carving” of artificial crystals (also known as “crystal glass”). The laser engraving technique is used to "engraving" a flat or three-dimensional pattern inside the crystal glass.

The engraving is an ancient art. The general engraving process is carved from the outside, and the desired shape is carved out from the outside of the material, while the laser can be used to "cast deep into the hinterland" like Sun Wukong. The principle of laser engraving is actually very simple. The laser should be able to engrave the glass. Its energy density must be greater than a certain threshold, or threshold, for destroying the glass. The energy density of the laser at some point is related to the size of the spot at that point. The same laser beam, the smaller the spot. The greater the energy density produced by the place. In this way, by proper focusing, the energy density of the laser can be lower than the glass break threshold before entering the glass and reaching the processing zone, and the laser exceeds this threshold in the region where the processing is desired, and the laser generates pulses in a very short time. Its energy can thermally rupture the crystal in an instant, resulting in a very small white spot, carved into the glass inside the predetermined shape, while the rest of the glass or crystal remains intact.