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Laser engraving is the practice of using lasers to engrave an object. The technique does not involve the use of inks, nor does it involve tool bits which contact the engraving surface and wear out. These properties distinguish laser engraving from alternative engraving or marking technologies where inks or bit heads have to be replaced regularly.
Sub-surface laser engraving is the process of engraving an image in a transparent solid material by focusing a laser below the surface to create small fractures. Such engraved materials are of high-grade optical quality.
Within a normally transparent material, the high intensity in the focus of a laser beam gives rise to non-linear absorption phenomena. As a result, microscopic cracks are generated on a narrowly localized spot, which makes the spot look white by multiple light reflection.
The images are created dot by dot with the workpiece being moved in two or three dimensions. The controlled motion is based on real-time position data acquisition and processing.
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