3D laser engraving machine uses high-performance laser and numerical control technology, mainly composed of optical system, control system and computer software. Through proper focusing, the energy density of the laser can be made. The laser generates pulses in a very short time. Its energy can instantaneously heat the glass crystal to ****, resulting in extremely small white spots. Not only can it engrave a predetermined shape inside the glass, And the rest of the glass crystal remains intact. https://www.cllaser-technology.c...-for-crystal-images.html