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The structure and advantages of carbon dioxide laser (CO2 laser)

(CO2 laser) is a gas laser with CO2 gas as the working material. The discharge tube is usually made of glass or quartz material, filled with CO2 gas and other auxiliary gases (mainly helium and nitrogen, and usually a small amount of hydrogen or xenon); the electrode is generally a hollow cylinder made of nickel; resonant cavity One end is a gold-plated total reflection mirror, and the other end is a partial reflection mirror polished with germanium or gallium arsenide. When a high voltage (usually DC or low-frequency AC) is applied to the electrode, a glow discharge is generated in the discharge tube, and there is a laser output at one end of the germanium mirror, and its wavelength is in the mid-infrared band near 10.6 microns; generally a better tube . A discharge area of ​​about one meter long can obtain a continuous output power of 40 to 60 watts.


Knowledge of function and structure of carbon dioxide laser (co2 laser tube)

Carbon dioxide laser is a relatively important gas laser. This is because it has some prominent advantages:

1. It uses the transition between the vibration-rotational energy levels of the CO2 molecule, and it has a relatively rich spectrum, and there are dozens of spectrum lines in the vicinity of 10 microns in the laser output. The high-pressure CO2 laser discovered in recent years can even achieve a continuously tunable output from 9 to 10 microns;

2. Its output band is just the atmospheric window (that is, the transparency of the atmosphere to this wavelength is higher); in addition, it also has the advantages of high optical quality of the output beam, good coherence, narrow line width, and stable operation. Therefore, it has many applications in the national economy and national defense, such as processing (welding, cutting, drilling, etc.), communications, radar, chemical analysis, laser-induced chemical reactions, and surgical operations.

3. It has relatively large power and relatively high energy conversion efficiency. A general closed-tube CO2 laser can have a continuous output power of several tens of watts, which is far more than other gas lasers, and a lateral flow electrically excited CO2 laser can have a continuous output of hundreds of thousands of watts. In addition, the lateral atmospheric pressure CO2 laser has reached a higher level in energy and power from the pulse output, which is comparable to solid-state lasers. The energy conversion efficiency of CO2 lasers can reach 30-40%, which also exceeds that of general gas lasers.

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