LASER is the electromagnetic radiation emission mechanism, as light or visible light, via the stimulated emission process. Laser is the acronym for Stimulated Radiation Emission Light Amplification. The increasing number of industries and their competition will always force them to implement the latest technology, leading to the implementation of laser systems for many industrial applications, including cutting, marking, stamping, printing and gravure. The biggest difference between the laser marking systems and other markings is the unique combination of speed, durability and computer control flexibility.
The laser marking system software is accessed through a PCI interface card. This sends digital signals from computer-based marking or gravure files to the engines and directs the laser beam to the laser product. CO2 Lasers create permanent lifetime traceability codes, reduce production costs and easily integrate with automated systems. The following UV laser wavelengths offer some lasers: 157 nm, 193 nm, 248 nm, 308 nm and 351 nm. It is used mainly for inkjet nozzle drilling, eye glass marking, etc.
Some lasers are most commonly used as the base platform for producing different wavelengths when configured properly. Infrared is the most versatile wavelength. This wavelength is used to mark a range of materials, such as metals, ceramics, composites and certain plastics. Surface annealing draws carbon and/or oxides from the base material to obtain a contrast. The beam produces sharp contrast to the surrounding area with little or no penetration. This is excellent for applications where the surface and contrast are smooth and unchanged. The surface rinsing is mainly used for medical implantation, coatings, tools, etc.
Surface gravure is the ability to alter the reflectivity and the contrast of metals by changing the metal surface finish. This is one of the most common laser marking techniques which typically does not exceed 0,0001″ deep penetration. Ablating is used to create contrast without damaging the basic material, usually using anodized aluminum, rear-lit buttons, and painted steel. This method uses various laser parameters like marking speed, pulse frequency, power, and focus to control the heat. It is used mainly for certain alloys, resulting in color variations. The required depth is generated by the vaporization of the base material in this method. This marking form is identical to surface etching; it is typically used for a depth of 0.0001″ to 0.005.” Repeated passes increase the mark’s depth.