Influence of light incident angle on reflectance spectra of metals processed by color laser marking technology
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A comparison of oxide films formed on the stainless steel surface during laser and furnace heating is presented. Obtained samples were examined by optical and scanning electron microscopy. In order to characterize the optical properties, reflection spectra within the wavelength range 190–900 nm were measured with a spectrophotometer equipped with the integrating sphere for incidence angles from 0° to 60°. The topology of obtained oxide films was characterized by scanning probe microscopy. Due to light interference in produced films, the coloration of treated area is observed. It was found that there is no change in the characteristic appearance of reflectance spectra at different light incidence angles, but a blue-shift occurs especially for the case of laser-induced films, which results in a visible change of surface color. This effect is associated with an interference character of originating color and features of surface relief under an oxide film.
KeywordsColor laser marking Oxide films Spectrophotometry Stainless steel Fiber laser
SEM and SPM characterization was made on the equipment of the Federal Joint Research Center “Material science and characterization in advanced technology” (Ioffe Institute, Saint-Petersburg, Russia). Raman and reflectance spectra were performed at the Center for Optical and Laser Research of Research Park of St. Petersburg State University. The reported study was partially supported by Grant for International scientific laboratory with state support of leading universities of the Russian Federation # 074-U01 and RSF Agreement No 14-12-00351.
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