ISSN:
1077-3118
Source:
AIP Digital Archive
Topics:
Physics
Notes:
We report on the observation of ultrafast (〈1 ps) recovery of all-optical modulation based on below band gap, optically induced excess absorption using pump pulse energies of less than 4 pJ. At higher pump pulse energies, the hot carriers produced by two-photon absorption significantly reduce the recovery rate. The increase in absorption recovery times at the higher densities of hot carriers is consistent with a contribution to the nonlinear absorption change from hot electron assisted absorption. The measured hot electron assisted absorption cross section of 2×10−20 m2 is in good agreement with the theoretical value.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.108655
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