Laser Characteristics by Material

Soda-Lime Glass and Quartz Glass Marking

CO₂ Laser Marker (Thin Beam Diameter Type)

A CO₂ laser marker that has a laser wavelength measuring 10.6 μm long and a high absorption rate on transparent objects is selected.
In order to produce micro-cracks on the surface of the glass, a laser with a thin beam diameter is selected and marking is performed as to keep cracks at a minimum.With soda-lime glass, cracks are sure to occur, so the key to creating clear markings is to make the cracks as small as possible.
Strongly irradiating the glass once will cause large and uneven cracking, so irradiation is performed repeatedly from three to five times to produce even cracking.
Setting a long approach length and performing marking while keeping a slight gap will cause temperature changes in the glass, making it even easier for cracks to occur.

An example of marking with strong laser power one time		An example of marking accomplished over several passes

Large cracks appear in the area where 3 and 2 have been marked		Even marking with micro-cracks

CO₂ Laser Marker

A CO₂ laser marker that has a laser wavelength measuring 10.6 μm long and a high absorption rate on transparent objects is selected.
Compared to soda-lime glass, it's easy to create markings without cracks on quartz glass.
Irradiating the glass with a laser beam multiple times at slightly high power will finish the marking with a slightly melted edge.
Because the glass melts easily, if the line width becomes thicker and thinner when marking characters, the laser spot stop timing is adjusted and marking is finished with even line width.

An example of marking with no cracks
(Processed with slight melting of the edges)