Abstract
The two photon absorption (TPA) coefficient (beta), the nonlinear refractive index (n(2)), and the third order nonlinear optical susceptibility (x (< 3 >)) of tellurium dioxide glasses were investigated using the absorption spectra, normalized transmission, and Z-scan methods. We studied the influence of different transition metals, with and without the rare earth ion Er3+, on the nonlinear properties of these glasses. The experimental results show that (n(2)) and (beta) are the highest for the glass consisting of cadmium oxide doped with rare earth ions. Consequently, the real and imaginary part of the third-order nonlinear optical susceptibility (x (< 3 >)) is the highest for these materials. Moreover, the presence of Er3+ increased the NLO coefficients the all the examined samples. The Z-scan result confirms, the glasses exhibit self-focusing effects and the sign of the refractive nonlinearity is positive.