We prepared chalcogenide glasses by a melt-quenching method and measured their linear and nonlinear optical properties to evaluate their potential applications to all-optical ultrafast switching devices. Their nonlinear refraction and absorption were measured by the -scan method at . The addition of Ag to glass led to an increase in the nonlinear refractive index without introducing an increase in the nonlinear absorption coefficient. The glass with a Ag content of revealed high nonlinearity ranging from 2000 to 27,000 times that of fused silica, depending on the incident optical intensity.
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