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switching time of Fe-doped quantum well saturable absorbers in a microcavity in range
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View: Figures


Image of FIG. 1.
FIG. 1.

Temporal evolution of the normalized differential reflectance is measured in pump-probe experiments on Fe-doped MQW microcavities with various Fe-doping concentrations: (triangular points, and ), and (round points, ) are studied here. These decay times are obtained by corresponding exponential fits (continuous lines). The saturation absorption dynamics characterized here are performed at wavelength where cavity resonance is adjusted to excitonic one (at for and at for and at for ) with an input pump fluence of . The inset shows the final structure of such asymmetric Fabry-Perot microcavities based on Fe-doped MQWs.

Image of FIG. 2.
FIG. 2.

Normalized differential reflectance of two Fe-doped MQWs microcavities is characterized as a function of input pump fluence, at wavelength where cavity resonance corresponds to excitonic absorption (at 1.565 and for Fe concentrations of and , respectively). The CR is mentioned for a change in the input pump fluence. Using the saturation law, values of FS are extracted from corresponding fits (continuous lines): and are obtained with increasing Fe concentration.

Image of FIG. 3.
FIG. 3.

Wavelength dependence of the CR at an input pump fluence of is demonstrated in the range. Continuous lines are guides for the eye. The bandwidth at CR is mentioned for the fastest microcavity device ( having a Fe-doping concentration of ).


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: 290fs switching time of Fe-doped quantum well saturable absorbers in a microcavity in 1.55μm range