Abstract
This article reports investigations on thermally stimulated third order nonlinear absorption in Cu-PVP nanocomposite thin films. Cu nanoparticles have been obtained using chemical reduction method and thin films of Cu-PVP nanocomposites have been obtained using spin coating technique. Thin films have been characterized by X-ray diffraction (XRD), Ultraviolet-visible (UV-vis) spectroscopy, Fourier infra-red (FT-IR) spectroscopy, etc. for structural and linear optical studies. Third order nonlinear absorption studies have been performed using open aperture z-scan technique under continuous wave (CW) He-Ne laser. Cu-PVP nanocomposites are found to exhibit strong nonlinear absorption coefficient stimulated by thermal lensing effect.
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