Principle and Background
These days, everyone has seen these glass products using a 3D picture inside. People are constantly amazed by the looks of the models inside whether it's a vehicle, a sailboat or simply a company logo.
In reality, the picture created in this way resembles a sculpture within a glass block. This is possibly the reason, why this Subsurface Laser Engraving decoration technique is indeed remarkably popular. It's the first technique that makes it feasible to make a sculpture' with the support of a computer (CAD).
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The first time the 3D models from in the computer can be transformed in something real away from the computer!
Subsurface laser engraving or 3D crystal laser engraving is a kind of glass decoration in which glass markers (tiny dots) are made within a glass item without disturbing the surface of the glass item.
Everybody has, largely in their youth, set a shoestring or a piece of paper on fire with the support of a magnifying glass. The sunbeam is concentrated or bundled from the magnifying glass.
At the focal point the bundled energy of the sunbeam is so high that the substance and the oxygen from the atmosphere react and hence the substance starts burning. The situation, in this case, is that the material has to have the ability to burn in the air, like paper, wood, dry grass, shoestring, etc.
Instead of sunlight, it's also likely to focus a laser beam with a lens. If the wavelength of the laser light is well-chosen, the bundled energy at the focus of the lens can socialize with glass. For glass, that wavelength is 1064nm or 532nm.