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How does a layser get inside a block of glass to make a design without leaving a mark?
Updated: 12/10/2022
Sub-surface laser engraving was developed by Russians in the 1990's. The non-technical explanation is that the laser is of a specific wavelength and precisely focused so that each time it fires it creates a tiny white dot within the glass instead of on the surface. This can be used to make 3 dimensional images.
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