Views: 13 Author: Site Editor Publish Time: 2020-09-09 Origin: Site
Lasers are often considered a new technology, but they have actually existed longer than many people realize. The theory of laser was proposed in 1957, and the first laser device was installed in 1960. Long before this, at the turn of the century, Einstein proposed to describe the main physical mechanism of laser action taking place, although he did not realize its potential. So what is the composition of the laser marking machine and how it works, Let's find it out.
The following knowledge points are listed below:
The composition of laser marking machine
The generation of laser beam for laser marking machine
The laser marking process for laser marking machine
There are three main components to any laser marking machine:
l The lasing medium of laser marking machine
It can be a gas such as carbon dioxide, a solid such as (Nd: YAG) or a liquid such as a dye. One of the characteristics of the laser medium is that it can store energy in a special method called population inversion. Laser medium will emit light (photons) in the form of a method to eliminate excess stored energy.
l The excitation mechanism of laser marking machine
Laser medium used to excite the energy of particles (atoms or particles). Energy can be applied in the form of current, discharge, light source, and the like.
l The optical resonator of laser marking machine
In the form of a system laser beam that extracts stored energy from a laser medium. The simplest form of an optical resonator is a mirror at each end of the laser medium. These mirrors are parallel to each other, so the photons continuously reflect (resonate) back and forth along the axis of the two mirrors. One mirror is 100% reflective and the other is partially reflective, so it transmits only some photons that hit it.
When photons pass through the laser medium of a laser marking machine, they cause the excited particles to release excess energy in the form of other photons. This process is called stimulated emission. These new photons are exactly the same as the original photons that caused the stimulated emission. They are the same color (wavelength), they move in the same direction, and they are in phase. The photons transmitted through the partial mirror form a laser beam. The remaining photons are reflected back through the laser medium and continue the stimulated emission process.
Laser marking for a laser marking machine is achieved by removing material from the substrate or changing the surface of the substrate. The most important consideration is the extent to which the encoded material absorbs the laser beam. This can determine the type of laser, and different wavelengths can have different absorption characteristics. If the laser beam is transmitted or reflected, encoding becomes more difficult or even impossible. For best results, the focused laser beam must be absorbed by the first few microns of the surface of the material to produce sufficient energy density. The surface can be altered in one of three ways:
l Coat removing of laser marking machine.
The laser is absorbed by the substrate or surface coating, causing the coating to evaporate to show the contrast substrate. An example of this process is the removal of colored ink printed on white paper or cards.
l Etching of laser marking machine
The laser evaporates the material on the surface of the substrate without necessarily causing any color change. (This is the process it happens in the laser marking of polymers such as PET. These marks look similar to embossing. On glass, lasers cause thermal stress, causing microcracks on the surface, causing tiny glass crystals to be ejected from the surface, creating a mark.
l Thermochemistry of laser marking machine
Lasers change materials by heating them to a temperature high enough to break molecular bonds. The new materials formed by this process may have different colors, resulting in an identifiable mark.
The major process are described above, so, did you get full knowledge of how a laser marking machine works and the composition of it?We also provide Laser Engraving Machine, Laser Cutting Machine, contact us now!
