Abstract
We show that highly nonlinear two-photon absorption coefficients can be obtained in infrared glasses (tellurium based chalcogenide glasses) at 1.06 μm and in the picosecond range (twice that of As 2Se 3). We observe an intensity-dependant two-photon absorption coefficient. This dependence is attributed to higher order effects occurring in nonlinear absorption process in our materials. The corresponding nonlinear coefficients are deduced from experimental data using a closed-form relation relating the effective two-photon absorption coefficient to the incident intensity. These coefficients become larger as the photon energy increases relative to the band gap.
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