Optics and Photonics Society of Iran

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Saturation of absorption (SA) is an intensity dependent behavior occurs at high intensity regime due to depletion of the ground state population during the laser pulse irradiation. In this report the observation of SA for silver nanoparticles (NPs) embedded in glass prepared by ion exchange method is presented. The nonlinear transmission and the Z-scan methods both were employed to verify the SA as well as to determine the saturation intensity and linear absorption coefficient for silver NPs. The light source was the second harmonic of the Ti-sapphire laser corresponding to 400 nm wavelength which is close to the surface Plasmon resonance (SPR) of the silver NPs. The obtained results show that the saturation pulse energy for the examined sample is 330 nJ corresponding to the saturation intensity of 845 GW/cm2. Observation of strong SA at low saturation intensity (Is) for the prepared sample make it as a promising candidate for applications exploiting SA phenomenon such as producing short laser pulses and all optical switching devices.

Keywords: Femtosecond laser pulses, Ion exchange method, Nonlinear optics, Saturation of absorption, Silver nanoparticles

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