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We have investigated the preparation and nonlinear optical characterization of Ge 20 Te 75 Bi 5  (GTB) nano colloidal solutions using the z-scan technique for three different concentrations. The transmission spectra of GTB nano colloid films have been investigated. FTIR spectra have been measured to confirm the presence of amines in nano colloidal solutions. Z-scan traces at 78 × 10 12  W/cm 2  laser intensity were used to study the nonlinearity of the samples. The nonlinear absorption coefficient increases with an increase in the concentration of nano colloids. The reported high nonlinear response is useful for optical limiting applications. The optical limiting behavior is also studied against different concentrations.

Concentration-dependent enhancement of nonlinear optical properties in Ge-Te-Bi nano colloidal solutions