(c) As you can see on this chart almost all types of glass are transmitting all wavelength longer than 300 nm Why it is impossible to engrave or cut with lasers of wavelength more than 300 nm (c) According to Keyence’s research, you may see that all metals except aluminum have downslope after 450 nm. This Data is For a Copper Standard Solution And Bears No Resemblance To Elemental Copper Metal This Plot Shows Substantial Copper Absorption (About 43 %) at 450 nm Absorption coefficient depending on wavelength for Copper Gold, Nickel, Iron and Aluminum which is why most fiber lasers for metal cutting use 1064 / 1080 nm wavelength. As you may see steel and pure iron are sensitive to wavelengths more than 1050 nm. For example, gold and silver are kind of sensitive to the wavelength 300-500 nm. (c) Based on Researchgate data you may see that aluminum absorbs wavelength shorter than 100 nm and almost does not of other wavelengths, has a small spike somewhere 850-900 nm. Absorption for Silver, Aluminum, Gold, Copper, Steel, Iron vs wavelength (different types of lasers) Under this plot you may see that Al, Ag, Au, Cu reflect almost all wavelengths after 1000 nm. (c) Reflectance for Aluminum Silver Gold and Copper about absorption reflection transmission principles More power is being reflected – less power will achieve the surface. There is a problem that some lasers do not cut or engrave on different materials, for example, metals, glass, plexiglass.Īn explanation is very simple – different materials absorb and reflect different wavelengths, therefore, more power is absorbed – easy cutting or engraving will be.
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