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Time-resolved mid-infrared pump-probe measurements in a quantum cascade laser operating above threshold reveal gain recovery dynamics to be two-fold: relaxation within a stage on a sub-picosecond scale and transport between stages on a picosecond scale.
Ultrafast electron dynamics in quasi-one-dimensional NbSe3 conductors was investigated by means of two-color pump-probe reflectivity measurements. The results clearly demonstrate the resonant probing of the charge-density-wave phases with different transition properties.
The first experimental measurement of electron spin relaxation in GaInNAs quantum wells is reported. An all-optical polarization switch based on the excitation of spin-polarized electrons is demonstrated.
We examine the temperature dependence of the ground state homogeneous linewidth in InGaAs/GaAs quantum dots. Measurements using a high-resolution spectral hole burning technique are performed on quantum dots in a semiconductor waveguide.
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