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Questions and Answers

1.What is laser?

Laser is an acronym of Light Amplification by Stimulated Emission of Radiation. A laser is a cavity that has mirrors at the ends and is filled with lasable material such as crystal, glass, liquid, gas, or dye. These materials must have atoms, ions, or molecules capable of being excited to a metastable state by light, electric discharge, or other stimulus. The transition from this metastable state back to the normal ground state is accompanied by the emission of photons which form a coherent beam. 

2.What is a Nd:YAG laser?

Nd:YAG laser is a solid-state laser of Neodymium: Yttrium Aluminum Garnet. It can be pumped by flash lamp or DPSS. 

3.What is the principle of laser sub-surface engraving machine?


At present there are two kinds of main laser sub-surface engraving machines. One is a diode pumped Nd: YAG laser sub-surface engraving machine, the other is a lamp pumped Nd: YAG laser sub-surface engraving machine. Diode pumped laser sub-surface engraving machine uses a diode pumped Nd: YAG to generate laser, it has high laser output speed and the particles and maintenances is 10 times high than the lamp pumped machine. Lamp pumped Nd: YAG Laser sub-surface engraving machine adopts Xenon lamp pumped Nd:YAG to generate the laser. Generally the engraving speed is limited by the repetition rate, and it needs to change Xenon lamp every two or three months. Lamp pumped Nd: YAG laser sub-surface engraving machine can meet the common requirement, and it has less risk with high rate of return.


Laser sub-surface engraving machine controls the laser output interval through the computer control technology according to the image point's array. One point controls one laser output. Each point shall be burnt singly inside the transparent material by one laser output, thousands of small burnt points form sub-surface engraving images. UGI laser sub-surface engraving use 3D worktable (X, Y, Z axis) to control the movement of crystal (Laser is not mobile) and can engrave the big size of crystal only need Z axis works, and the software control the worktable, laser and scanning mirror all.

4.What is a point-cloudy image?

Point-cloud image consists of abundant small points that are created by the special point-cloud converting software from a common two dimensions or three dimension image. These points shall be engraved by laser machine according to the array order one by one. Each point will be burnt inside the transparent material; all the burnt points form the engraved image inside the crystal.

5.What does the laser sub-surface engraving software include?

Engraving an image inside the transparent material successfully needs two kinds of software. One is point-cloud converting software, the other is engraving control software. The point-cloud converting software is used for converting BMP, ASC and DXF etc image file format to another image file format, which consist of abundant small points. The engraving control software is used for controlling the laser beam output interval and the directory of laser beam or X/Y/Z axis.

6.What are the materials that can be engraved inside?

Transparent materials such as crystal, glass can be engraved inside. K9 grade crystal is the best.

7.How to choose a crystal?

UGI recommends you use K9 grade blank crystal with high quality. The crystal with inferior quality will affect your output and waste your time. Commonly, a crystal with superior quality has no bubble inside, no black dot inside, no dirt inside, no ripple inside, no scratch, high definition and high transparence.

8.How to create "Color Image" laser crystals?

On the basis of laser interaction with the material, chromatic laser inner-engraving technology are made to use of nonlinear mixed interaction of laser, glass substrate and doping ion, and achieved 3D chromatic inner-engraving in a transparent glass creatively. It has greatly improved the laser inner-engraving products appreciation value, compared with that of the existing colorless inner-engraving, which simply relying on the light scattering of laser.


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