Fraunhofer Lines Fraunhofer lines, also known as absorption lines or dark lines, are spectral lines observed in the spectrum of sunlight or other light sources. These lines correspond to specific wavelengths of light that are absorbed by elements present in the sun's atmosphere or other intervening media. In laser engraving, Fraunhofer lines may influence the absorption characteristics of certain materials, affecting engraving performance and the appearance of engraved marks.
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