Intuitive model to include the effect of free-carrier absorption in calculating the two-photon absorption coefficient
Applied Physics Letters1992Vol. 60(2), pp. 166–168
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Abstract
We report a simple model to include the effect of free-carrier absorption (FCA) in calculating the two-photon absorption (TPA) coefficient, β, and demonstrate its use in evaluating β from nonlinear transmission experiments. When only linear absorption and TPA are considered and the experimental analysis is carried out in the usual way, β is calculated to be 2.0 and 2.7×10−10 m W−1 for TM and TE polarizations, respectively. Including the effect of FCA in the waveguide, the model predicts β to be 1.5 and 2.0×10−10 m W−1 for TM and TE polarizations, respectively.
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