Comparative study of nonlinear optical properties of Ge-S-I glasses with different macrocompositions

Nonlinear optical properties (nonlinear refraction index and two-photon absorption coefficient) of chalcoiodide glasses of the GexS90 − xI10 system obtained by fusing germanium, germanium iodide and sulfur in an evacuated quartz ampoule were studied as a function of their macrocomposition. The dependence of nonlinear properties proved to be nonmonotonic. For stoichiometric ratio of the number of Ge and S atoms, the nonlinear refraction index reaches its minimum value and the two-photon absorption coefficient is maximal.