Laser gas can be roughly divided into:

1. He-ne Laser - is the first Laser gas developed. The medium is neon, but there is much more helium than neon in the mixture of helium and neon. , though its work efficiency is very low, the output power is not high, usually only a few milliwatts or tens of milliwatts, but its good beam quality, and visible light band of red (wavelength is given priority to with 0.6328 microns), manufacturing and the structure is simple, and can demonstrate the characteristics of laser light and light waves, most use, widely used in: calibration, collimation, teaching experiment, display, precision measurement, interferometry, holographic technique, testing, thermal output, medical treatment,... And so on.

 laser mixture gas

2. Carbon dioxide laser (CO2 laser) - high power laser excited by discharge. The gases in this laser are mostly helium and nitrogen, but the gas in the medium is the least carbon dioxide, because a lot of helium and nitrogen help a small amount of carbon dioxide get into the inversion of the group. Einstein's theory that long wavelength media are more susceptible to stimulated emission. Carbon dioxide laser is a kind of molecular laser gas, which takes carbon dioxide gas molecule as the working medium and USES the resident energy formed by the two vibration energy states (symmetrical vibration and flexion vibration) of CO2 gas molecule to generate laser light. Because the vibration energy of gas molecules is very low, which is easy to be excited. In addition, the quantum efficiency generated by the laser is up to 50%, so the CO2 laser has a very high operating efficiency, which is the most appropriate as a laser with high power output. Its output wavelength is in the middle infrared band of 10.6 microns, which is very easy for water molecules to absorb, so it is very effective in burning and peeling human surface tissue, but this band of light requires the use of optical elements of special materials. Because of its high output power, obvious thermal effect and wide application, it has always been the laser type with the highest output value in the international laser market. Therefore, CO2 laser develops rapidly, and there are many kinds of CO2 laser on the market according to different USES and different powers.

3. Halogenated inert gas is an excellent ultraviolet laser medium, including argon fluoride, krypton fluoride, xenon fluoride, xenon chloride, etc. All of them output uv with an efficiency up to 1%.

4. Inert gases - argon, krypton, xenon, etc. Argon ion and krypton ion laser, respectively output purple, blue, sky blue, green and yellow, orange, red and other wavelengths of laser. These lasers feature high input and output, mixing the two gases and making them look white but separate the colors, making them highly useful for stage effects.