It's accomplished by focusing an intense beam of light very accurately on a point inside the glass, and triggering it for a very short time. It's usually used for novelty items, but there are some companies out there using it for higher purposes. It's a pretty expensive and delicate process, but it's getting cheaper. This process is called Sub-Surface Laser Engraving, or SSLE. i expect that someone can explain this to me or recommend me some bibliography or something because i'm really intrigued about it. i attached a self made schematic drawing of two laser beams travelling one keeps on travelling through the crystal and the other stops in a determinate altitude and burn one of the points that composes the photo. when the laser beam is travelling through the crystal how can you make the burn spot at the right altitude? how can they stop the travelling laser beam in a determinate altitude to draw a burned point in the crystal? because if they don't stop it with something it will keep on travelling farder than the crystal or will burn the crystal when the laser beam touch the crystal. you have a laser beam traveling in to the crystal you can do this and move the laser left and right easily but. here are some videos of the machines working and the finished products. Hi everybody i can't understand how this machines work.
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