Laser light energy is measured using wavelengths, or nanometers (nm). Specific wavelengths are used for different applications and can only be generated by certain types of lasers.
Fiber lasers stimulate a rare-earth metal known as ytterbium to generate photons on the 1,064 nm wavelength. This wavelength is ideal to mark metals, as a good quantity of its energy is absorbed by the material.
CO2 lasers stimulate CO2 gas to generate wavelengths between 9,000 nm and 11,000 nm, covering a wide range of organic materials that require different wavelengths. The most common wavelength for organic materials is 10,600 nm.http://www.whamark.com/laser-marking-machine/
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