He-ne Laser：was among the first to produce continuous Laser output, 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 so use popularization, is widely used in: calibration, collimation, teaching experiment, display, precision measurement, interferometry, holographic technique, testing, thermal output, medical and so on.

Argon Laser: is a kind of ionized gas Laser, with low voltage and high current arc will argon gas ionization discharge way, up to the high order again, produced in the inversion, get hundreds of spectral lines near the green and blue wavelengths of Laser output, stronger are eight, but the most commonly used is 0.5145 microns (green) and 0.488 microns (blue). The operation efficiency of argon laser is not high, so the working current and power consumption are very high. It is urgent to pay attention to the load of electricity and the circulation of cooling water when using argon laser.

Carbon dioxide laser (CO2 laser) : Carbon dioxide laser is a kind of molecular gas laser, which is two vibrational energy levels of gas molecules. Using carbon dioxide gas molecules as the working medium, the CO2 (symmetric vibration and flexion vibration) state population is used to generate laser light in reverse. Since the vibrational energy order state energy of gas molecules is very low and easy to excite, and the quantum efficiency produced by laser is as high as 50% or so, CO2 laser has a high operating efficiency and is the most appropriate laser with high power output.

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