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Internal glass engraving is performed using solid-state lasers, which operate in various wavelength ranges depending on the requirements. Internal engraving always requires a clear, smooth and transparent glass surface so that the laser beam can penetrate unhindered - in order to specifically modify the glass structure there and thus create a laser engraving inside the glass.

Furthermore, laser engraving on the inside can often also be carried out on frosted glass: Since usually only one side of the glass is frosted or coated, the internal engraving can be done from the clear side of the glass in this case.