Nonlinear optical properties of CdS1-xSex crystallites-doped glass in femtosecond time-scale.*

We report the nonlinear optical properties of CdS1-xSex crystallites doped in glass measured with a 150 fs Ti:Sappire laser at 775 nm wavelength. The nonlinear absorption and nonlinear refraction coefficients were measured to be $1\times 10^{-20}$ m$^{2}$/W and $7\times 10^{-15}^{ }$W/m , respectively, by using a single beam Z-scan nonlinear spectroscopy technique. Experimental data is theoretically fitted and discussed. The dominant physical origin of the optical nonlinearity of the material is two-photon resonant electronic process. The large nonlinearity indicates CdS1-xSex crystallite doped glass is an excellent candidate for photonic applications, such as defense for homeland security, battlefield enhancements, optical switching, and pulse shaping.