Views: 3 Author: Site Editor Publish Time: 2020-12-25 Origin: Site
In the industrial process, laser welding has a wider application range and higher frequency of use than traditional welding. During the forecast period 2016-2027, the global laser welding machine market is expected to have good growth. Laser welding machines are in great demand in the fields of entertainment electronics, medical equipment technology and photovoltaics. This article is about the structure of the laser welding machine and how the laser beam comes out.
The following knowledge points are listed below:
The general elements for lasers
The principle of laser generation
The welding lasers structure
The laser is composed of these elements:
l Laser medium
a material that generates laser light. The medium for solid-state lasers usually consists of a host, doped with materials of active laser elements.
l Pump source
provides the required activation energy laser medium to make laser generation possible.
l Laser resonator
The laser medium that controls how the laser is generated, consists of a rear 100% reflector and a front partial reflector.
The generation of the laser beam is a three-step process, in which the steps occur almost simultaneously.
1) The spontaneous emission-pump source provides energy to the medium, so that the electrons inside the atomic atoms of the laser medium are temporarily elevated to a higher energy state. The excited electronic state cannot stay there indefinitely and drop to a lower energy level. In this process, the electrons lose the excess energy obtained from the pump energy by emitting photons. The photons produced by this process are called spontaneous radiation and are the seeds produced by the laser welding machine.
2) Stimulated emission-spontaneously emitted photons will eventually hit the higher energy state of other electrons in the electron. Due to the speed of light and the density of excited atoms, this process takes place in a short time. The incident photon "knocks" the electron from the excited state to a lower energy level, producing another photon. The two photons are coherent, which means they are in phase, have the same wavelength, and move in the same direction. This process is called stimulated emission.
3) Magnification-Photons are emitted in all directions. However, some people traveling along the laser medium to attack the resonant cavity mirror will be reflected back through the medium. The resonator reflector of laser welding machine defines the amplification direction of the priority stimulated emission. There must be a larger proportion of atoms in the excited state than the lower energy level is more likely to be amplified. This is a necessary condition for laser generation due to the "particle inversion" state of more atoms in the excited state.
The laser bar for yttrium aluminum garnet laser welder is a synthetic crystal of yttrium aluminum garnet (YAG). YAG material is a "host" material, contains a small amount of neodymium, is an active element. The YAG crystal is physically hard, stable and has good thermal conductivity, which makes the laser operate of laser welding machine at a high average power level. Neodymium is a good laser material because it can produce higher peak power than any other doping element. The size of the laser bar is selected according to the power and optical quality. The maximum rod size is limited to a diameter of approximately 15 mm (mm) and a length of 200 mm to ensure crystal quality and temperature management.
As the name implies, fiber lasers are produced in flexible doped glass fibers, which are usually 30 feet long and 9 to 50 microns in diameter. For most industrial lasers, ytterbium is used as a doping element because it provides sufficient conversion efficiency and a wavelength of nearly 1 micrometer, which conforms to standard optical transmission components. Thulium can also be used for tuning between 1-2 micron wavelengths, and is commonly used in low-power plastic welding applications. Around the central core is an additional layer that allows pump energy to be transferred to the core along its length.
So now you have a clear picture of the laser welding machine,CO2 LASER MARKING MACHINE,FIBER LASER MARKING MACHINE now?
