The laser of CO2 laser marking machine is usually made of hard glass, and generally adopts a layer-and-sleeve structure. The inner layer is the discharge tube, the second layer is the water-cooled sleeve, and the outer layer is the gas storage tube. The quality and performance of the laser tube directly affect the working efficiency of the CO2 laser marking machine, which is also one of the important components of the CO2 laser marking machine.
The main structure of the laser tube of the CO2 laser marking machine is as follows:
1. Resonator: This part consists of full mirror and output mirror. The full mirror of the resonator is generally based on optical glass, the surface passes through the gold film, and the reflectivity of the gold film near 10.6um reaches more than 98%; the output mirror of the resonator is generally based on germanium (Ge), with 10.6um radiation as the foundation, through a multilayer dielectric film.
2. Hard glass: This part is composed of discharge tube, water cooling jacket, gas storage jacket and return gas tube made of GG17 material. Enclosed CO2 lasers are usually three-layer casing structures. The inside is the discharge tube, the middle is the water net jacket, the outer layer is the gas storage jacket, and the return gas tube is used to connect the discharge tube and the gas storage tube.
3. Electrode: CO2 laser generally adopts cold cathode, cylindrical. The choice of cathode material has a great impact on the lifetime of the laser. The basic requirements of cathode materials are: low sputtering rate and low gas absorption rate.
The two ends of the discharge tube of the CO2 laser marking machine are connected to the gas storage tube, that is, one end of the gas storage tube has a small hole connected to the discharge tube, and the other end is connected to the discharge tube through the spiral return tube, so that the gas circulates in the discharge tube and the gas storage tube. Exchange the gas in the discharge tube at any time. It is widely used in non-metal marking and engraving such as acrylic and plastic products; and has developed the ability to mark low carbon steel by electroplating. CO2 lasers are also used in flexible circuit boards and polyimide and polyester boards for electronic instruments in automation systems.
