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The optical gain dynamics in an InGaAs/AlInAs quantum cascade laser is studied by midinfrared pump-probe experiments and electro-optic sampling. We find an extremely fast gain recovery time of <1 ps.
In this review, we report on the study of terahertz (THz) intersubband (ISB) transitions and on the optical devices based on them. We use time-resolved THz spectroscopy to examine ISB optical transitions in semiconductor quantum wells and quantum cascade lasers (QCLs). From these measurements, we obtain important information on the carrier relaxation, scattering mechanisms, and the gain. The waveguide...
Photoconductive Terahertz emitters with integrated Bragg mirrors are presented which show increased THz emission efficiency due to cavity enhanced absorption. These emitters also allow intracavity THz generation in mode-locked Ti:sapphire lasers.
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