Classification of lasers

1. Classification of lasers：

(1) Carbon dioxide laser: 

The CO2 laser is a molecular laser. The laser discharge tube is filled with CO² gas and other auxiliary gases

(mainly helium and nitrogen, generally a small amount of hydrogen or xenon); One end of the resonator is gold-plated total reflection

mirror, the other end is a partial mirror ground with germanium or gallium arsenide. When applying a high voltage to the electrode (generally

DC or low-frequency AC), the discharge tube will produce a glow discharge, and there is a laser output at one end of the germanium mirror. make

Principle: cauterization, high temperature gasification. 

Wavelength: 10600nm 10200nm (for coated materials) 9300nm (for PET materials) 

(2) Fiber laser 

Fiber laser refers to LD pump (915nm) light emitting light, with rare earth element glass light

The fiber acts as a gain medium to finally obtain a laser with a wavelength of 1064nm. 

Principle of action: cauterization, high temperature gasification 

Wavelength: 1064nm 

(3) Ultraviolet laser 

The full name of the ultraviolet laser is LD all-solid-state ultraviolet laser, and the frequency of the crystal doubling by LD (808nm) is 1064nm,

The laser is again doubled by 1064nm to 532nm, and finally mixed to 355nm wavelength. 

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Principle of action: The force of the ultraviolet laser on the object is determined by its wavelength, and its coding process is directly broken

The chemical bonds composed of atoms of badly linked substances, the process of action does not produce heating of the periphery, but directly converts the substance

Separation into atoms. When the atomic structure of the chemical bond changes, the surface of the material will produce color aberration, forming a marker,

without destroying the material. This marking process is different from "CO2 laser" and "fiber laser", which does not

Heated, gasified, cauterized, so it is called a "cold" laser. 

Wavelength: 355nm 

Note: The most essential difference between the three lasers is that the wavelength is different, acting on the same material, reflecting the junction

The results are different.