The visible laser absorption property of chromium-doped polyvinyl alcohol films: synthesis, optical and dielectric properties
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New films for visible laser filter were fabricated from poly(vinyl alcohol), PVA, and various levels of chrome(III) chloride, CrCl3, by a known simple process named casting. The structure order degree, complex interaction, as well as optical filtering characteristic of the PVA + xCrCl3 (x = 0.037, 0.37, 3.7, 18.5 and 37 wt%) samples were investigated via the diffraction of the X-ray, Fourier transform infrared spectroscopy and UV/Vis/NIR spectrum, respectively, while the behavior of optical limiting was tested by set-up laser limiting measurement. The increment of Cr3+-doping level in the PVA gives some results as, (I) a marked increase in the degree of random structure of the samples, and (II) two clearly absorption peaks are seen around 428 nm and 608 nm with a progressive increase in the intensity and a slight shift to a higher wavelength. (III) Three distinguished energy gaps were clearly observed, as well as, (IV) the dielectric spectroscopy of the samples was decreased with increasing the Cr3+-doping, which contributes to the strong interaction among the mixtures. Furthermore, at concentrations above 0.37 wt% of Cr3+-doping, a notable decrease in the output detected laser power was observed.
KeywordsCr3+-doped PVA XRD/FTIR Energy gap Optical properties Optical filter
The authors extend their appreciation to the Deanship of Scientific Research at King Khalid University for funding this work through the group’s research program under Grant No. R.G.P.2/13/39.
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