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- W2894539405 abstract "We study experimentally and theoretically the intensity-dependent off-resonant ultrafast third-order nonlinear optical response of As2S2 thin films. At low intensity, we observed saturable absorption with a negative (self-defocusing) nonlinear refractive index (n2) which at higher intensity switched over to reverse saturable absorption with a change in the sign of n2 to positive (self-focusing). Our findings constitute compelling evidence on how to dynamically tune the optical response with the intensity that has its origin in the combined effect of two-photon absorption and Pauli blocking. The results were explained with the help of time-resolved measurements and rigorous theoretical and numerical simulations." @default.
- W2894539405 created "2018-10-05" @default.
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- W2894539405 date "2018-09-27" @default.
- W2894539405 modified "2023-10-16" @default.
- W2894539405 title "Intensity mediated change in the sign of ultrafast third-order nonlinear optical response in As<sub>2</sub>S<sub>2</sub> thin films" @default.
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- W2894539405 doi "https://doi.org/10.1364/ol.43.004787" @default.
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