What is Sub-surface Laser Engraving or a 'Bubblegram'? Technology Explained

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by Super User, 3 weeks ago.
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Let's find out how they put 3D images into glass objects. Known as a 'Bubblegram', vitrography or sub-surface laser engraving, this technology has been around for a very long time but remains quite niche in its applications.

Resources I used in research this video:
https://en.wikipedia.org/wiki/Bubblegram
https://en.wikipedia.org/wiki/Laser_engraving#Sub-surface_laser_engraving_.28SSLE.29
https://www.google.com.na/patents/US6630644

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